I don't know that much, there are more people that more.
Well, Softboiled would be your best bet for healing, since there is no other move that has the same effect for Wish. There is Healing Wish, but KOing Blissey is a bit risky. :\ So, I would say anything other than WishBliss, such as the standard and Cleric set.
You can go with one of the Eeveelutions, they get it via egg move. Togekiss, Gardevoir, Latias, Jirachi (but it is are hard to find for non-Shoddy) all learn Wish by leveling. Sorry if I am not much of a help. >.<
You know a ton about competitive battling, so I have a question for you: Since Wish is an Event move only, what is the best set to use for Blissey for non-Shoddy battling.