As above virtually no chemical will attack gold.
No nickel stripper as sold by Brownell's will remove gold.
The reason gold is know as "The Nobel metal" is because virtually no chemical will affect it.

If you use something like Naval Jelly it WILL etch the steel and that will require polishing to get the smooth surface back.

Even attempting to polish off gold doesn't work well because it's near impossible to get it ALL off from crevices, pores, and tight areas.
Then when you attempt to apply a chemical finish like bluing or parkerizing, the gold left will show, giving the surface a freckled look of the new finish and the remaining gold.

There's only one sure way to remove gold without screwing up the original metal and that's to have a firearms plater DE-plate it.
I strongly recommend using a GUN finisher company rather then a jeweler of bike plater.
Guns is different, they ain't bikes or rings.

Companies that can do it are.......

Ford's Custom Gun Refinishing | Crystal River, FL

Custom Gold & Silver Plating, Antique Finishing: Reliable Electroplating: Chartley, MA

Tech Plate

Possibly Ron's....
Ron's Gun Shop - New & Used Gun Sales & Service. Concealed Carry