I agree it would make it more difficult, but is a solution without making a new patch or making a mod.
Giving up two corps and one army, would be 500 MPP & should still allow Germany to take France, but would slow Germany down. Some experimentation would bring to light where the break even point was.
Everyone would agree a point system would be the best route to go, but without mods and no new patch, this is a solution that could be used now.