That doesn't make much sense, the only reason the KV-8 is occasionally used right now is because it has phenomenal anti infantry. Making it worse would put it closer to a T-34 which would probably make it even less attractive to use because then people would likely generally go for the safe bet of getting a generalist vehicle over an AI specialist, as is the case with the Hetzer. It needs to be good in order to be worth the risk of getting one instead of AT capable vehicles.
It makes perfect sense. KV-8 is currently very expensive and as you say it is gamble. By making iit either a call-in or lower powerlevel one could use it t3 build support by SU-75 or one would gable less since the investment would be smaller.
As for the T-34/76 and hezter comparison they are simply of the mark. Hezter is allot cheaper/weaker and it supported by less AT assets. One could bring the power level of the KV-8 to around 100-120 so that is was at least cheaper the Soviet premium mediums like T-34/85 and M4C so that would not compare so bad to them.
In any case PzIV should not have so much trouble dealing with an "AI" tank like the KV-8.