This might already be mentioned, but there's no way in hell Smart is lasting until the 12th pick. There's even chatter now that Orlando is seriously looking at Smart at #4, which would presumably leave Exum at #5. I don't see anyone at #12 who's an upgrade over Burke, assuming we don't get Smart or another PG in a trade.
Edit to add that there must be something to this proposal that is not clear or that I misunderstand. It makes absolutely no sense to trade Burke and the 23rd pick for the 12th pick.
Edited further to add: Jeez but people here are giving up on Burke awfully quickly.