Ok, but you're not playing 50bb effective stacks on the flop, you're still playing 100bb deep against 3 guys. Would you make a standard bet? Half of the deck are scarecards and you're OOP. If you overbet it you're setting yourself up to play a big pot with one pair in a 5-way pot.

If it checks to the button and the button bets it's a different story. I would shove over at this point.

When in doubt spoonitnow is always right of course, but I'm not so sure about the bet on the flop.