Dash, he'd win him over with promises that he could be open and proud of himself rather than holding back, also he'd be more or less a cooler, edgier version of his dad in the old reel footage.
Also it'd be less traitor and more unaware of what he's really about. Jack needs to have a song and dance to hide his malicious supremacist ideals. It needs a veneer of reasonability before being pushed to full magneto. It doesn't help that Jack definitely has the past 20 or so years to work with as justification.
A Super "ethnostate" where they're free to Super doesn't sound TOO bad, it's only when you push the idea of superiority and maybe an internal hierarchy based on ability, and external hostility/isolation that it becomes something bad. Though I guess that's just retreading a lot of old X-men plot lines.