It will be part of the transition to a wing from a jacket that you will no longer have a multitude of dump pull dongles to choose from. There is just the one, and it is on the left rear/bottom. That is where it is.
Uh-oh. I have been using a BP/W for years (single tank, doubles and rebreather). Unless I'm head down, I use the dump button on the end of the wing inflator hose.