BTER is unlikely to add CINNI, they were approached earlier and didn't like it, its unlikely they will change that now because of timeshares especially since they have no Cinni to benefit from the timesahres snapshot.
BTC38 will take one look at the history here and issues other exchanges have had and completely avoid it.  No exchange is going to add or continue to support Cinni long term in its current state.  Half the exchanges have delisted Cinni, the dev does not even update the first post.

The priority should be to work on fixing the wallet, i spoke to other devs and the current problem is apparently a relatively fix but the longer its ignored the more of a problem its will become until the point where exchanges will be forced to drop Cinni simple because its cause more problems (forking, resyncing, incorrect balances, stuck transactions etc) then is worth an exchange spending time on, especially when as far as they can see the dev has abandoned Cinni, no updates, no communications and no fix for the issues that have been mentioned many times.   Snapshot can happen anytime buts it worthless if people were not able to withdraw or move their coins safely before it happened because of these current bugs with Cinni that should have been fixed long ago.