Thanks for the comments/ideas everyone.

I think I've combined all suggestions into one and made a switch ring/cavity cover. With the braided wire, the switch doesn't sit central in the cavity but the cavity isn't round either so don't see it as a big deal. Made a paper template, used that to cut a piece of acrylic plastic to size. Had to sand the edges of the cavity smooth to make it look a bit neater. Then used Tarzans grip to glue on a piece of veneer, it doesn't really match the surrounding area but I took the opportunity to add a few more burls.

To mount it, shaped some quad I had lying around to make the recess for it to sit on. Had to file one piece to allow for the wiring then glued in with titebond. Tried to line up the mounting screws with the switch positions.
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