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An index pulse alone is not enough you also need a pulse train signal like an encoder channel to track the spindle velocity:
linuxcnc.org/docs/html/examples/spindle.html

Can roller with 0-10v inverter be V axis for example and unrolling handled in gcode?
Any better appproach?

Moved the post with the second batch of images in here.

Yes, you don't need the hal encoder comp at all and unless you have a base thread
(not practical with an Ethernet connected device), the hal component will be quite slow.

Oh dear..My poor old brain.
So, the MPG is connected to the correct pins, but the input designation I should be using is perhaps hm2_7i92.0.7i73.0.2.enc0.count to get access to the high speed values?

So take the encoder count stuff out of the hal thread and instead couple
net mpg-out ilowpass.0.in <= hm2_7i92.0.7i73.0.2.enc0.count

I doubt this is all that helpful, but I did write a custom VFD module for a Commander SK over RS485/modbus, about a dozen years ago (for LinuxCNC 2.6 .. ancient stuff).  Here is the code, in case there's any value for you:

github.com/tangentaudio/cmdrsk_vfd

I'm going to revamp that machine soon and I most likely would choose one of the methods you're thinking about rather than stick with a custom component.