I would consider .100" min wall thickness acceptable (not preferable), Savage certainly accepted close to that for their ON/OFF muzzle brakes as the 30cal brake was factory threaded 9/16-28 which left a wall thickness of about .114". Considering that manufacturers have to be lawyer friendly and they were fine with .114 then I would think the .100 that you will end up with should suffice given you exercise some care. I would certainly want a bit of a shoulder to mate up to for a suppressor, so I would consider trimming the barrel back for that purpose as previously suggested.

FWIW I had a 458WM that had 5/8-24-RH threaded muzzle which left me with about a .060 wall thickness and it did fine.

In the end I would say if you can add more "meat" to the wall thickness by either trimming the barrel shorter or just picking up a heavier profile barrel then I would highly recommend it, but I tend to be an overkill kind of guy with these things.