That daughter's reserved for a foreign monarch, not a domestic match with her uncle. While uncle/niece marriage was not exactly frowned upon at the time, it's better to marry the hypothetical eldest daughter of the Dauphin to someone prestigious, preferably with a proper crown of their own.
Also, Ferdinand is a Spanish name, and I'm not sure that would go over so well with the French. Jeanne and Philippe are fine names, but Jean after Francis's grandfather works better as a name, especially since Jeanne and Philippe are named after Eleanor's parents, so Francis will probably get to choose the name for at least one child(even if he doesn't name the daughter Louise for his deceased mother who died in 1531).
Philippe would take Charles's place in Crepy, and instead of Maria of Spain with the Netherlands or Franche-Comté/Anna of Austria with Milan being offered here, it would probably be Juana of Spain with the Netherlands or Franche-Comté/Margaret of Austria with Milan. Juana is born in 1535, one year younger, and Margaret is born in 1536, and she's ideal for a butterflied bride since IOTL she was a nun, so one doesn't need to worry about children and later descendants being accidentally butterflied away.
