But are the panzer IV's cheaper? The second one obviously, but i like this idea.
Imo the second one would be cheaper, similar to the T-34/76, since the Ausf. J was made to simplify and cheapen the manufacturing process, which meant less viewports, simplified exhaust, no turret motor, metal top rollers, and 2 less of them (3 on each side). The Ausf. H would probably cost 10-20 more than the standard Panzer IV, since you're paying extra for the increased protection and the crew penalties aren't cripplingly bad.
Assuming Relic would refuse to give them a medium tank in the name of being ~unique~, these would be great for OKW Commander call-ins.