I could see the spinaker pole being a bit on an obstacle for this trick.
I'm small. <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />
Seriously, you got it in one. As the boat starts to come up, the person on the inside grabs the striker and gets a leg around the beam. The person on the end of the righting line has to commit to getting wet, but the other doesn't and their full weight winds up on the tramp, preventing a flip in the other direction. The move isn't as tricky as it sounds - you have to be quick but not preternaturally so. The boat is coming down to meet you as you're climbing the righting line, grabbing the striker and getting a leg up.