The only new thing they'd have to do, is come up with test questions, a way to have people take the test, and a way to track who's passed and who's failed.
And then we progress to the "Such and such obviously just had Google up while he was taking the test because he obviously didn't know what he was doing" stage.
It's really not that easy. This is not an issue of actual problems with the way X-wing events run. The VAST majority of X-wing events go off without a hitch. I can only think of 3-4 cases in the last year of reported problem events, and given the tendency of aggrieved people to run to the internet to complain, that's actually pretty remarkable.
This is far more an perceived problem than a real one, and if you're seriously going to fix an image problem you need a strenuous effort to do so. A couple of questions slapped into an online form isn't going to do it.