I think an open jam is probably the best option on reflection.
Thing is, the blinds and antes will amount to around 2.5xBB, and by open jamming, you"re risking 19x to win that 2.5x. If you wait for a spot to shove over someone who has opened to 2.5x already, you"re risking 19x to win 5x - double the return. Better still, if there is a raiser and a caller or two, your 19x squeeze shove could be picking up 7.5x or 10x - significantly better than 2.5x in the OP.
By open jamming 19x with 33, chances are you either win 2.5x, or lose the lot, but you will never be in a strong position to double up unless you get lucky with the board - you only dominate 22 and any x3 hands, none of which are likely to call your shove. If called, you have to hope he has unpaired overcards, and that you win the flip.
imo there are much better spots to shove your stack, and with 19x, the urgency is not critical.