You haven't tried Brian Wood's X-men??? Oh it's wonderful (and Bling! is getting a subplot in it involving Mercury, but the kids also help fight the villains in backups, which is cool).
OR... it could lead to Northstar being the LEAD/protagonist of an Alpha Flight movie if he picked up popularity in the X-films. Think of Tom Hiddleston, the wonder he did make everyone a fan of Loki. That could be Northstar, if they cast the right person.
Personally I'd cast Iwan Rheon, he's a wonderful actor, very charismatic on screen, and makes everything he does GOLD! And he's very gay friendly (hilarious in Vicious).