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It would be easier with a starting hal/ini file set because
while the Mesa and LinuxCNC pin names are known,
the specific signal names used are configuration dependent.

(signal names are arbitrary and everyone uses different ones)

I resigned.
Can you tell me what lines you would put in the fictitious .hal and .ini files to make the step-dir spindle work?
for lathe config XZ(C?)
Or a link to an example.

thanks

The led name will be the button name with '-led' on the end.
in the above example the pin name would be 'SCREENNAME.mybutton-led'

I checked my randomly-purchased liner scale (found at EMFCamp) and that is an LS 903 (no C) so is probably no help.

Late to the party, but I have recently switched both my machines to run from the Asrock N100DC-ITX board.
Latency is "fair" rather than good. But they are avaialble, run from 12V DC and can be booted from an M2 SSD for a neat installation in the machine cabinet.
www.mini-itx.com/~N100DC-ITX
(Unhelpfully, out of stock, maybe because I bought three of them from there.)
Apparently they are picky about memory, especially at 12V rather than 19V, so maybe buy memory at the same time.

You might want to set feed-hold when the needle is down, and release it when the needle is up...

I think that if you scale the potentiometer voltage to position, and latch it in HAL (you can do this with a mux component, with the output wired to the input, and triggered by machine-is-on) and add that to the scaled encoder position from the motor encoder, then you would have a "good enough" absolute encoder emulator.
Then configure HOME_ABSOLUTE_ENCODER in the INI