Wheel adapter studs?

To each their own, but a properly constructed wheel spacer is perfectly safe if properly maintained (check the damn lug nut torque).
Agree, but as you well know, there's a pretty big difference between adapters and spacers.
Ran nines with homemade billet spacers, I doubt I would try that with adapters.....
(And yes, I would check ALL the lugs periodically, not just the ones with spacers)