Yeah, that's the idea. I solve this problem this way, so I always export my models in a T-pose with a scale of 200-300%. You can check it out on these titans, for example.

But in the case of your models, some problems might arise. I don't know for sure what you're working with and what hidden issues might pop up. Heroes 5 and all these old plugins sometimes like to create some incomprehensible technical mess out of nowhere. So, in any case, I wish you good luck!)