well I'd shove straight after the flop.
1) I'm not sure about the limit we're talking about here, but from the preflop action I kind of assume that many players are aiming for Lo pot, so likely for them to have most of the low cards in their hole cards already. Less chance of runnin into a A-5 straight, therefore.
2) even if you DO run into the straight, consider a fair number of outs for a nut full house for you as well. Not even mentioning that a 5 would bring u the middle straight as well.
3) you've also got two of the clubs, so that's the two cards someone can not use if drawing for the flush right there.. or may even bring YOU the winning flush, who knows.
so basically you are losing half of the pot (or less? depending on how deep you stack is compared to the most lucky freeroller), but you've still got pretty good chances of getting back more than you put in.
Would be my style.. I agree it's a bit fishy but I'm sticking to it.