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There are only 2 restrictions in the mod:
1. Neutral creatures with a total AI Value greater than 16,000 cannot join, for M and S maps, AI Value > 4,000
2. Creatures do not join if the hero's army contains undead.
If there was a template with a bunch of 12,500 guard posts, like in some anarchy schemes, then diplomacy would be quite competitive. And specifically guard posts, so that these stacks could be easily found.
Accordingly, due to point 2, this does not work:
on LM10, join a bunch of small guards with a necromancer and convert them = super value