It arrived today!
Here is 1 minute in the shop as a quick test.
I think it will work out fine.
What I see is that the grey is a residue. It wirewheels off just fine
The rust has reduced the surface through MINOR pitting which leaves a fine grainy surface
The polish pass just shined up the surface, so the grainy surface is shiny (not our preferred outcome)
I would suggest that I make a gentle pass with my surfacing tools to put the metal back to smooth, then buff. They should shine right up. If that sounds too "invasive" I can just wirewheel and buff.