Thanks for these suggestions, I really can’t find anything on RS, despite thousands of “panel mount” toggle switches, very little in terms of mounts, brackets, panels, enclosures or anything.
Maybe I’m being a bit fussy about style but I ended up looking at classic car dashboard parts and went for this little chrome panel off eBay. Should stop me accidentally grabbing wires and I think it will look right on the ‘Bud. I might even be able to get the light to come on

. I’ll definitely be asking how to wire it up when the time comes, I haven’t done a coil tap before. I imagine the switch will need replacing.