A Schelling point, as I understand it, is a choice that has value only because of the network effect. It is not "the best" by some criterion, it's not a compromise, in some sense it's an irrational choice from equal candidates -- it's just that people's minds are drawn to it.

In particular, a Schelling point is not something you agree on -- in fact, it's something you do NOT agree on (beforehand) :-)

Do you think that it is impossible for an FAI to implement CEV?

I don't know what CEV is. I suspect it's an impossible construct. It came into being as a solution to a problem EY ran his face into, but I don't consider it satisfactory.