In fact, I might argue that giving France a larger OOB, but turning all category B divisions into GAR or MIL might give you a better Battle of France in the first place. There certainly were good French units, but a lot of them were just meant to hold static fortifications while better divisions did the heavy lifting.
A whole other question, which we can't address right now, is whether or not there will be any advantage to using division templates that have lousy equipment or manpower in HOI4. HOI3 just has a brigade type with different stats, but I'm kind of hoping that the game will have some way of simulating these category B divisions without them being just an inefficient use of manpower. (HOI3 made MIL cost less manpower, so if you used them, at least it wasn't a complete waste of manpower.)
The best (and closest to history) solution, was the one done in DH. The allied doctrine only allowed them to build armored brigades, not form full armored divisions. That way the historical breakthrough could be achieved. 3k tanks attached to different divisions lose to to 3k tanks in a Panzer Group.
HOI4 could also make formation of Panzer divisions/corps/armies doctrine limited. The German doctrine is the one which will allow the earliest access, other doctrines catch up later. That way historical battle of France can be made without idiotic buffs/debuffs