At the moment, I'm busy exploring Space Empires V and don't plan to play this gauntlet. However, if I'm going to do it, I probably would abandon any game that doesn't start on a big continent. After about 30 turns, if I don't meet at least 5 civs, it probably means that I'm on a small island. The same thing goes for G-Minor, not enough civs=>not enough religions=>slow culture win.

That's something worth trying.
The two failures were promptly killed by archers and the workers recaptured. Only found a single hut
and no nearby copper 

I could never have taken over 4 AIs at this point with non-Inca civ. I'm 99.99% sure that I can't do it. Of course, it's doable with the Inca, but you are playing with just normal warrior here. Again, I'm 99.99% sure that I won't be able do it at this point.
So I stop payin attention for a few turns and then came to the realization that I had captured the Persian copper supply, destroyed their iron city, and the Spain (the other Civ on the continent that I had a +6 dip with) didn't have either. So I should have been able to continue my conquest of Persia, build up and infrastructure and tech parter with Spain while I built a military to take her out.