Maybe both of the oracles have the same effect as the normal oracle. Won't they be in neither Athenian or Spartan territory so conquering them holds rewards, but you have to go out of your way a bit (into Epirus and into Boeotia / Phocis).
PS: What civs have you decided on? Depending on how you use the wonders, Corinth, Argos and Boeotia should be able to be independent easily.
An afterthought...
Won't two happiness in every city make Athens just a little bit too strong compared to Sparta (if the Great Theatre was in Athens)? One in every city would be better and then give three or four happiness in Athens; or you could do a 'Shakespeare's Theatre' and give 8 or 9 happiness in the city it is in and give nothing for the other cities.