WI: King Charles VIII married Margaret of Austria?

So this is something I've wondered about off and on for a good while now. For those of you who don't know, King Charles VIII of France was the last direct Valois King of France. He was mainly known for two things, starting the Italian wars by trying to claim Naples and for being the first husband of Anne of Brittany. However, if things had worked out differently Charles would have instead married Margaret of Austria-Burgundy, his original fiancée. If Charles had kept that marriage, he would have gained the Imperial County of Burgundy and the territories of Picardy and Artois. Instead he insured Brittany was annexed to France.

So my question is what if Charles had married his original fiancée and gained most of France's modern eastern border almost three centuries earlier? What would the short and long-term repercussions of such a swap be? For the sake of argument lets say Charles gets to have his cake and eat it to: Duke Francis of Brittany still dies in 1488, Anne still proxy marries Maximilian of Austria in 1490 and France still invades in response (as via treaty Francis's daughters were not to marry without the approval of the King of France).

However, instead of marrying Anne himself Charles instead decides occupy the Duchy and bring Anne to the French court as a hostage. Therefore he still gains parts of the Burgundian inheritance, has control of Brittany de-facto and is legally in the clear, as per the Treaty between France and Brittany. I think Maximilian would kick up a fight (his new wife being abducted by his future son-in-law is bound to cause drama) but looking at his OTL actions I doubt he would try anything. Worst comes to worst France pays off the Pope to annul the marriage and either marries Anne to a loyal vassal or locks her in a convent and forces her to cede her Duchy to France. Either way Charles VIII basically wins. So what would the ramifications be for France, the Habsburgs and Europe?
 
The Bretons rebel, with English and Hapsburg help, welcoming some young Duke sponsored by either or both said allies with the future promise of wedding Anne once the French were thrown out.
 
The Bretons rebel, with English and Hapsburg help, welcoming some young Duke sponsored by either or both said allies with the future promise of wedding Anne once the French were thrown out.

Neither England nor the Habsburgs were really in any position to help though. England was still recovering from the Wars of the Roses and dealing with the occasional revolt from the Yorkists while the Habsburgs attention was on Hungary and the succession issues there.

Considering that Castile, England and the Habsburgs only offered token aid OTL, I think chances are we'd see the same thing happen here. Also, technically Maximilian was married to Anne by proxy so "some young Duke" would be the King of the Romans.
 
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