WI Margaret Clifford became queen

I'm new to historic fan fiction and debates, so I may sound stupid but please correct and help me if I'm wrong or sounding stupid. So basically I'm creating a fan fiction/a future story plot where Mary Tudor actually gives birth to a son Charles on 30 April 1555, her first (phantom pregnancy). He becomes King when she dies in 1558 and in Mary's will Phillip becomes regent for their son until he is 16. Elizabeth is married off in a less important marriage to Frederick II of Denmark. Mary, Queen of Scots still has James but both Mary and Darnley die in an influenza epidemic. Prince Charles, Prince of Wales grows up and Phillip wanting a catholic alliance, organizes a marriage with Charles to Victoria of France (dead daughter of Henry II) who ITL lives. Charles and Victoria have a few children in which a daughter Mary survives the longest but dies. Charles grows up with Phillip's catholic teachings which arouses suspicion with the English court as to whether Charles will become like his mother. This may sound ridiculous but Charles begins to show sings of mental instability and an interest of restoring the Catholic faith. Charles eventually ends up doing what his mother does and the English nobles force him to abdicate and Charles attempts to flee England (although he is poisoned and dies) in 1583. A Spanish Armarda as OTL happens but earlier and Phillip attempts to place his daughter Isabella as Queen. The Spanish lose the war and the English declare Margaret Clifford as Queen of England, due to her being the strongest legal claim to the throne and the fact that she is English, unlike James who is Scottish and I believe the English don't like the Scottish? Would making Margaret queen and the whole fan fiction make sense, and if it does, what would you think Margaret would do as queen?
 
The extent to which Philip will influence his son's upbringing is questionable- I am imagine the English nobles would be vociferously opposed to any attempt to extract their king to the continent, and I'm not sure Philip possesses a huge amount of political clout/capital to enforce his wishes on whoever's doing the day to day business of ruling (and overseeing the king's education) in England.

Also, I'm not sure the kid would be called Charles- Philip already has a son named Charles at this point.

And I'm not really sure what you're going for re: religion- you have Charles "restoring the Catholic faith", but wasn't that already done under his mother? And surely the English court will be composed of the Catholic types favoured by Mary- why would they be suspicious of their king also being Catholic? I suppose it's possible they've come to a sort of religious moderation and are worried the overzealous king will mess with things.

What happened to the Greys (...did Catherine still do her thing with Seymour? Did they still get thrown in the Tower? Did Seymour's sister live long enough to vouch for the marriage existing?)? Are there any Lennoxes about- you've disposed of Darnley, but there's still the matter of his younger brother Charles and/or an alt!Arabella? Any of those could try and have a tilt at the throne.

Does Margaret have her OTL husband and kids? Because it's possible some people would be in favour of passing over her in favour of her son (Ferdinando would be 24 in 1583).
 
Few issues - 1) The English succession was established in law - Mary and issue, Elizabeth and issue - then the Grey daughters and then Margaret Clifford - if you wish to change that then Charles will have to persuade Parliament to change it when he is of age. By primogeniture its - Mary, her son, Elizabeth, Mary Q of Scots and issue, Margaret Countess of Lennox, Henry Lord Darnley, Charles Stuart, Lady Catherine Grey, Lady Mary Grey, Margaret Clifford Countess of Derby and issue.
2) Mary's death - The act for her and Philip's marriage was clear that in the event of her death Philip would act as regent - presumably he would appoint a deputy likely a high-ranking English aristocrat to act for him in England. The Act was also clear that the child wouldn't be able to leave England without Parliament's consent.
3) If Don Carlos dies as in OTL then this child, let's name him Henry/Enrique (which is more likely than Charles), will become his father's sole legal heir in Spain, Italy and the Netherlands - the Spanish won't be keen on a none Spanish raised heir either - so it presents a problem for Philip long-term.
4) With a child for Mary Elizabeth's marriageability drops like a stone and neither Philip or Mary will be keen on a non-Hapsburg aligned match - Philip will perhaps as in otl try to marry her himself on Mary's death - but she will probably remain at home - a glimmer of hope for remaining Protestants and English Protestant exiles - a source of suspicion for court and council.
5) Mary married Darnley because her hopes were on the English throne that has declined with the birth of Mary's son - so she might not be that keen although to be fair she did at first fall for him so it's possible...what happens to Darnley's brother another strong claimant.
6) It's arguable that England was probably majority Catholic (or at least Henrician Catholic) at the time of Mary's accession despite the year's of Protestantism under Edward VI - his or rather Cranmer's reforms had prompted sedition etc. Mary and Pole's harsh punishments for heresy and her bowing the knee to Rome again did more damage to the reputation of Catholicism that Edward's VI's reforms quite frankly - if that still happens (In OTL the Spanish Ambassador and Philip actually tried to persuade Mary to a more compassionate approach - aware that Philip and Spain were being blamed for it rather than Mary herself) then her son will as Elizabeth did inherit a largely Catholic country. Protestant uprisings are possible but I doubt they'll have the push that the Catholic risings against Elizabeth did.
7) I think it unlikely that Mary's son would be deposed in the long term as by the 70s he's probably ruling a fairly content largely Catholic country - now if he is a rigid as his mother then perhaps a crackdown might prompt a rebellion or two.
8) Now say he succeeds he won't be ruling in his own right until 1570 to 73 ish - depending on Parliament, the council and his father probably. If England has been dragged into any disastrous wars with Spain you might even get a Catholic revolt lol - let's say his aunt Elizabeth had died childless (she can get the smallpox she caught in otl), you will still need to get Scotland out of the way and in this tl Mary's heir might well be Catholic.
 
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