I decided to stop over-thinking the pickguard thing and just do what I'd originally thought of - the veneer option. The veneer came from a sample pack I think I bought at a woodworking show many years ago. Of the dozen or so in the pack, some were a bit wavy, so I chose the cleanest and flattest one for the job. It looks like Tassie Blackbutt a bit.

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Some 5min epoxy seems to have worked well, and I've done a very preliminary rough shaping. The veneer is only 1mm thick, so when I bevel the edge you'll still see the white/black/white edge of the original but that should work in okay with the paint scheme. In some ways it's a pity to cover that nice veneer with paint, but I'm sticking to my plan. I'll let it dry properly overnight before doing any more tidying up around the edges and doing a bit of scraping on the surface to clear off the excess epoxy that somehow magically found it's way there.

Next step is to finally decide whether to fill in the jack cavity, and then do the routing near the lower horn for the pickup selector switch.