how about checking to see the action before you decide to make a move?
Id let mp1 and CO take a shot at it and hope the button doesnt isolate but he has to be careful of doing that without a monster because of your flop check IMO.
Saying that, poting it and watching a shorty push, which is good for us IMO will put the button in a position where he has to tip his hand strength to you making the flop decision more easy.
If the shortys are donkish surely they love to push this flop if they have any piece or even nothing for that matter?