I can't say whether it's actually possible or not, I just know that some people are modifying the .Exe file and increasing the number of creatures and artifacts, some have even increased skills to level 8, and I've also seen on heroescommunity that someone has increased the maximum level.
So, as a newbie when it comes to working with .Exe files, it seems to me that this is possible, but whether it's actually feasible, I think those who created the frameworks will be able to answer. Perhaps in the future, when they take a look at this topic.