> Digikey carries motorized sliders like they use in audio panels.

Yes, I've thought of those. Digikey PNC100SY-ND is US$40
(NZ$55) at 50+, and that pretty well cripples the project. I like
them (more visual than a rotary), but way too dear

Motorised pots used to be available here quite cheaply, I still
have a couple from that time, but they have gotten expensive
and rare

I might make enquiries at Panasonic, see if I can do a deal. I'm
not above hacking old mice for encoders, plenty of those around,
but convenience counts for something when you've got a few to do

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