I think you could come close with a buffer on a Dremel or drill......just that you'd want to secure it very well to work on it & go slow , take some time with it.............safe & sane, right?
I've only done one cannister for Alvin's Homer grill I picked up here in town & held 'till he got here....
Not quite as hyper, but I just started with very fine sandpaper (400, I think?) ,went around the circumference using Barkeepr's Friend until the oxidation & small pitting was worn off, then used Mother's Mag polish to finish...........no CLR used.................
Not being so used to using it, I didn't get a super shiny finish, as it tends to dry out as it's rubbed out......all that was done by hand only & I'm sure with even a modest poilishing hub on something motorized (wouldn't have to go out & buy a bench grinder, just buffing rotors for a drill, say) it could come close to Mikey's......
Let's see if
@AZ_MIKEY will check in with some pointers, as he's a pro at stuff like this......