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And your statement that "the time spent is not worth the goal" is complete nonsense – the goal is absolutely worthwhile!
This is not my opinion, but the opinion of Psatkha. On the contrary, I tried to convince the modders to work on such a hero, but in several comments, I was told that they had already tried to create something similar and it is possible, but very time-consuming and difficult. Moreover, due to the lack of convenient software, it is a hassle, and therefore the result is not worth the effort, if a decent result is even possible. But if I were working on this project, I would definitely spend the time, even just to try to create a unique hero, but of course, the decision is not mine, and the person in charge of the project has already made a decision.
The question is not whether it can be "done," but how to attach animations to the model in the game engine's format! There is no converter! Therefore, the only way is to painstakingly fit the necessary parts from other suitable models to the skeleton of the mounted hero from Sacred Heroes! In principle, it is clear how to do all this, but as they say, you need to take and do it, but it won't work out on the first try, and you will have to work very, very hard, and the opposite shore, where the positive result is located, is not visible! That is, in other words, you need to spend a lot of time on something with an unknown result! Unfortunately, I don't have any extra free time for such experiments right now!