Given UTG's ability to limp premiums, I'd reckon he does this with small and middle pocket pairs on occasion as well?
Suppose we assign him a range of QQ+,88,66,AQ (he's not calling that flop shove with AK imo), then we're behind but almost flipping vs him. 40% if he doesn't have AQ in his limping range.
SB probably has some 66,88, weaker flush draws and Qx hands here. We're a big favourite vs him (and so is UTG).
We're obviously not folding here, but the issue is between calling now and shoving almost every turn, or shoving immediately.
With the dead money in the pot, I'm willing to take the risk and shove here, while our equity is highest. Shoving when the flush comes in could kill the action, and shoving on a blank turn isn't getting folds enough while our equity gets halved, imo.
Shove now, imo.