Buddy threw up a meat loaf sandwich through the school university-8-year-old school rental Mares Proton. That's a tiny second stage for reference.
Everything cleared fine and instantly through the exhaust tee, but he does wish he had chewed his food more.
Unless surface waves are making the queasiness worse, I would finish your spewing bouts on the surface before descending.
If underwater, tongue block too on the inhale so you don't get bits of food backwashing from the second stage into your mouth.
And if you have to, tap the purge, don't hammer down full-hard-and-long. If there's a chance for the purge to projectile vomit back at you, a short purge would be much less frightening than a full on long purge.