If Ostheer was in fact OKW then that would be a great idea.
But not, so not.
Why does it make more sense on OKW? OKW already has a light tank.
A Panzer III would be more thematically appropriate. Either an M or an N, depending if you want the 50mm long gun or the 75mm short gun. Could be buildable from T2 after teching T3 (building not required, since it's in T2). T2 would be too early, and T3 would be too late, so I think that's an okay medium.
I mostly wanted to see the Hotchkiss because I though tit was a
shit cool unit in vCoH that I would want to see again. It happens to actually have a chance to fill a role for Ostheer, so I'd like to see any new light tank at this point.