[Edi]

I'm somewhat confused whether you are referring to my Better Indepedents mod or not. If you are, then not going to happen. That's not the purpose of that mod and doing what you are suggesting via mod commands is dicey in any case since you have no control over when heroes or multiheroes appear. Doing it by map command is also impossible if you're talking about timers.

But if you want a tougher AI, see NT Jedi's suggestion and try out the Better Independents mod linked in my sig. It makes the AI use national troops a lot more, which can lead to surprising results, especially if youplay on Impossible.