I'm not sure that that kind of balancing is really necessary.
Those types of cases are already covered by things like bots, bots, bots!, which just extends the existing bot system.
Waiting until you have advanced circuits (for suit power/modular suit) means you're practically at the bot stage anyway. And this mod doesn't provide much advantage over the existing construction bots system.
What I can probably do is add a configuration for how many you get at the start, and a range limiter, but that's probably as far as I'll go in terms of balance.