Indeed,in 1942 we would probably have it.Polish medium tank,23tp/which was only planned in 1975/ would probably get french 75mm,too.
But,considering how bad we were in making tanks,it probably woud be not done yet.
1 - at least in polish army it could be modified to target tanks with new sights,some was even made that way,and our army considered how many more is need.
They used anti-bunker ammo capable of piercing 70mm steel - which means,all tanks in 1939.