As a matter of empirical fact, I think this is wrong. Men in sexist societies are really glad they're not women (and even thank God they are not in some cases). They are likely to run in horror from the Rawlsian veil when they see the implications.

And anyway, isn't that paternalism itself inconsistent with Rawlsian ignorance? Who would voluntarily accept a more than 50% chance of being treated like a patronized child (and a second-class citizen) for life?

And how is killing gays in the slightest bit a paternalistic attitude?

I'd never heard of Omelas, or anything like it.. so I doubt this will be part of CEV. Again, who would voluntarily accept the risk of being such a scapegoat, if it were an avoidable risk? (If it is not avoidable for some reason, then that is a fact that CEV would have to take into account, as would the Rawlsian choosers).