Question about Sanctuary map 3 strategy

[magritte2]

I've just gotten to the point where I've captured the Sanctuary town and the orcs have joined my side. But I gather the other towns on the map are orc towns. The obvious thing to do is to convert the towns (which is the advice you get in the walkthrough) which makes the orcs angry. What I was wondering was whether you could take a different strategy and build orc troops for the use of your orc hero.I know it flies in the faceof the normal 1 hero with giant stack of doom approach that normally works in HOMM 6, and it might result in not getting Irina leveled up as fast, but is it a viable approach for this map (normal difficulty)? I guess I ask because otherwise the orc hero and troops seem like pretty much a waste.