I've been trying to devise a way around this as well. I'm working on a design right now to add a velcro flap under my left shoulder bell so i can show off my mandalorian death's head tattoo. thinking an old west 'long johns' style flap of some sort in the nether regions for when nature calls.
BUT, a few hours later you would need to take off some other armor to pee .... Unless you make use of another straw, I would hate to see one extend from the cod piece into a urinal, that would just be tooooooo freaky :puke :fettpre