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I'll try not to engage enemy heroes at all, instead buying up the available army and running along the route: boots - garrison - swamp castles. The main goal is to reach the destination within 7 days without a starting castle, but I think Tazar, with an expert artifact and boots, can handle it. Otherwise, the money will either go to hiring advanced units or buying an army. The second option seems more preferable. I don't know how it will turn out, but I'll give it a try. I can also use the psionic units to further strengthen Tazar, because the idea of just overwhelming a swarm of griffons with brute force doesn't appeal to me.
Added 14 minutes ago
Removed HD+, on 221, Wistan appeared with three stacks. Thanks for the advice.
Added 26 minutes ago
Haha, after clearing the hydras on 221, I bought 106 upgraded lizards and 74 upgraded dragonflies, and the computer players ran home :) I also upgraded the wyverns. On 231, I can move towards the garrison, in theory.