I'm interested to know why exactly you think that getting into the vortex would be such a big deal?
1. They would be flipped unceremoniously. So what? They either recover like a dart or they pull their parachute. It ain't going to damage them. Being flipped is more serious the bigger you are, not the smaller.
2. The big vortices come off the outside edge of the flap, not the wingtip, and they do so at landing speeds at high weight, not ~200kts