What would happen if france recognized isabellas claims and made Edward king of france. What would the ramifications of a such a move be, how woud it change Europe and is it even possible?
Impossible doesn't covers it : this is anti-possible.
1) The masculinity was already the rule for royal fiefdoms (even if never established for kingdom, fail of being needed so far) and apanages.
2) Eventually, it was accepted (if not by great enjoyment) that the brothers of the king had precedence over his daughters, increasing the importance of masculine sucession
The whole point was eventually : "Could someone transmit a right that it doesn't have?" The answer had some serious odds to be "Lolno".
And admitting the pairs would agree with this, Isabelle would have to concede the daughter of Charles IV precedence. Even with this, there was no way that she would have see Edward recognized as king, as his claims were dubious at best.
3) The Valois were really popular (having prepared, at the contrary of virtually everyone else, their entry) among the french nobility, while Edward was young (under tutelage of his mother and Mortimer), foreign and with...well, almost real political importance outside Guyenne and maybe Flanders.
4) And, of course, pairs didn't wanted a foreign king in first place, so Edward's candidacy was doomed.
There wasn't were it mattered. French nobility was cut from his anglo-norman counterpart since Philipp II (at the exception of Flanders, more driven by a common defiance towards Late Capetians and Valois; and Guyenne due to a strong link with their dukes).You're right that it was a serious push for this to ever approach being likely, but remember that there was some support in France for Edward.
It was not the university, as an institution, that debated that : it was a gathering of universitarians, pairs, clegy that decided, eventually, that not only Philip V was the rightful ruler but that women were excluded from sucession and couldn't transmit the title.The University of Paris, for example, debated the matter intensely for many months and eventually decided that Edward's claim was the superior one
Even there, the UoP didn't said Henry V claim was superior, they considered the treaty passed with Charles VI legit, and the Lancastre as his rightful heir (If Edward III claim was dubious, Lancastre's was clearly not valid) at the contrary of french sucessions laws (particularly the one where a king couldn't remove his heir from sucession, as he was more the recipiendary of the crown than its owner)I'm starting to think that it was the reign of Henry V when the UoP favoured the English claim, and that may be for obvious reasons. I'm not really sure though.