Ind/Phi would be very strong at the mid levels, but once you get to Emp+, I don't think it's any stronger than any other good pair (ie. Phi/Org, Fin/Phi, Fin/Org, Cha/Org, Cha/Fin, etc...)
Charismating/Creative I think would be very strong. Yes, you have the case of wanting but not needing the monuments early, but as mentioned, there are already 2 creative leaders with monument UB. I think it would be strongest early since not only do you get the extra happiness from Charismatic and monuments, but you also get cheap coliseums for more happiness. Throw on cheap libraries and you can get a strong, early specialist game going.
Have no idea why Pro/Org wasn't in. Sounds like a decent combo at higher levels. Probably they either didn't want to add another leader, or couldn't find one good enough.