2) To do this we need Britain > Spain + Portugal and Germany > France. The first is not really possible until the end of the English-Dutch Wars, say about 1680 or so. The second is not possible until Germany is united, OTL in 1866. By 1680 the idea of France and Spain being nations in their own right is firmly established; even when the Germans occupied France in WW II they didn't annex it. And as much as the British fought with the Spanish they never entertained the idea of annexing it AFAIK. So this requires an initial POD long before 1500. Not possible in the time frame of the OP.
3) Easy; have the Roman Empire survive and hold onto Gaul and Iberia. The division may not be fair (Italy 100%, Scandinavia 0%) but it is divided between the two.
Yeah, I know it's cheating, but I really don't see any other way to do it. By the time Italy was reunited in 1866-1870 they were already weaker than France and remained so to the present day. And there has not been a time since the Viking era when Scandinavia had a chance of ruling any part of France or Iberia. (Viking descendants, like the Normans, yes, but actual Scandinavian rulers, no.)
4) Any number of possibilities here. Start after Poitiers (1356). Have Burgundy remain independent and have the English retain Normandy, Gascony, Picardy, and Acquitaine as separate entities. Have the Moors hang onto southern Spain and Castile, Aragon, and Galicia remain separate with an independent Portugal. Eleven by my count.
5) Given the geography, implausible. The Pyrenees are the perfect geographical boundary; almost any reasonable sequence of events will result in a political division which follows them. Furthermore there are virtually no comparable north-south barriers on either side of them on which to place a dividing line between east and west; the only one of note is the Rhone. (The boundary between Portugal and Spain is mostly artificial.)