Maybe, but there won't be any voice acting for it, as he's playing the trumpet.
We need to remove the Isabel flag from the combat model and add an effect of a man with a flag... I'm just saying that it's possible, I'm just too lazy to do it.
Added 3 minutes ago
The only downside is that the man won't be highlighted when you hover over him, but I don't see any other options - it would be too much work to extract animations, models, combine everything, and fix broken bones.
I tried installing the xreplayser mod for Heroes, and it's there for female models, but it's static, and none of the animations work.
What if Isabel is put on a horse from a male combat model?