Wait... OCC, AW, Spaceship only, Huge Pangea (pangea fixes the resource problem.. continents perhaps also, but I don't play that), 60% water, warm, warm, 3 billion (or whatever trio most favors the AIs in terms of growth and production), and you can't use the Great Library (either through building or capturing it... this seems in the spirit of the AW requirement). Even though I haven't played Sid that sounds impossible there, so Emperor, Monarch, Regent difficulty? Maybe we'd have to say a Large map instead.
Sirian's "Finally Ready for Regent" at say Emperor... maybe even Monarch, might also challenge some of the better players.... a regent game for that matter also... with the victory condition of domination.