"Color wheel" victory condition

[DrPraetorious]

I'd like to try a game with randomly assigned allies who are eachother's enemies.

The basic idea is that you arrange the start locations in a circle - and the victory condition is that you have to kill everyone EXCEPT the people on each side of you (and those two people want to kill eachother), like the color wheel in that card game.

Depending on the map layout this might take too long, so victory condition could be: you have to kill everyone except the two people directly ACROSS from you, although this absolutely requires an odd number of players to work.

Your assignment of allies is random, but within the overall framework of hostility diplomacy is permitted.

Anyone interested and which would people prefer (allies adjacent or allies remote)? How many provinces/player for a game like this? I like smaller maps, generally. There are a number of maps that could be fiddled with to get this effect. I'm making a wrap-around map that achieves this without needing a ring, but to be blunt I'm lousy at it so I'll probably fiddle with an existing map.

I prefer: sites 60, indies 7, rich world, slow research, but this is also open to negotiation.