This might as well be the best idea since King Canute spread his towel on the beach that one faithful day. That's right, tell the cadets to stop it. Tell them they're fools and they're debasing themselves. Then when you're finished go and find the nearest gale and piss into it.
Since people are coming round to the idea that the similarities between a flying slave galley and Guantanamo Bay aren't necessarily limited to the colour scheme, why not pop one of those brave pills yourselves instead of foisting them upon the blind wretch next to you - by refusing to fly with him?
They might not be in the union but you are. If you accept only to form a crew compliment with those not on these terms, or if the trainers refuse to teach them onto the line, then would that not require that they get put on proper pilot-sanctioned, Balpa-accepted terms and conditions? I think it would, but then of course it would mean the big boys had to grow some rather than telling the most vulnerable to go do the dirty work.