Vitruvius
Donor
So, just make things clearer, here is an idea of how the succession could have gone:
1478 - Mary of Burgundy dies in childbirth alongside her child (who would be Philip the Handsome). Initially Maximilian tries to keep the territories under his control, but fails.
Guelders and Zutphen recognize the young Charles of Egmond as their ruler. The rest of the Burgundian territories are disputed between John II, Count of Nevers and John I of Cleves, with Louis XI of France pressing for lands too.
John II of Nevers would be the claimant under Salic Law. However, few territories followed it, and with his eldest daughter and heir already married to John I of Cleves, he accepts a deal where he gets the Duchy of Burgundy, Artois and Flanders, but they all should be given to France once he dies. All the rest goes to John I of Cleves.
1481 - Both Louis XI and John I of Cleves die, and John II of Nevers denounce the earlier treaty. The conflict gets mixed with the Mad War. Eventually he is forced to accept the arrangement made.
1491 - John II of Nevers die. His territories are annexed by France. But when Charles VIII starts his Italian Wars John II of Cleves offers the Franche Comte to the French king in exchange for Flanders and an alliance during the conflict. The proposal is accepted.
Is it likely?
Looks good. I think Louis may take Picardy and the Somme towns immediately though. Louis had seized them from Charles the Bold repeatedly and he's likely to want some payment 'up front' for agreeing to the Cleves-Nevers compromise. I also wonder whether France would ever give up Flanders once they have it, its just so valuable. So perhaps the Flanders/Franche-Comte swap is agreed to before Nevers dies. I guess the real question is what is John of Nevers trying to gain by denouncing the Treaty during the Mad War, more territory for himself at the expense of Cleves? If so why would France care about that, could mean more for them when he dies. Or is he trying to secure the inheritance of his daughter Elisabeth? That would warrant rebellion against the French and may lead to a settlement regarding Flanders. There's also his second daughter Charlotte to contend with who in OTL brought Rethel to her husband. She's much younger than Elisabeth and unmarried so she may be used as a pawn during the conflicts of the Mad War as she becomes a potentially wealthy heiress should the Treaty be set aside in her favor. Perhaps she even makes a better bride for Charles VIII if it means she secures Nevers, Artois, Rethel and Burgundy for him.
Considering Guelders, seems like John of Cleves will at least try to claim it. Ironically Charles of Guelders may actually ally with Maximilian if Max pledges him all of Guelders. On the other hand he might be able to cut a deal if John of Cleves' son John II married Charles' sister Philippa, perhaps with upper Guelders as her dowry. She was the OTL wife of Rene II but not until '85.
And I like the map, though Cleves also controls Mark too giving their domains a bit more reach into Westphalia. Thus I think this independent Netherlands will probably be focused on expansion north and east into Frisia and Westphalia.