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Yes, typical VFDs have an analog 0 to 10V control method.

The breakout shown converts a PWM signal from the PC parallel
port to a 0 to 10V analog signal for the VFD.

Stepconf can set this up:  


 

Yes, I have the same breakout board from the picture. I thought that the spindle speed is controlled by an analog signal with 0 V to 10 V. I found about this in the documentation (spindle control) but I don't know how to implement it.

The RPi-400 may also be a solution, it's clocked a little bit faster that a RPi-4.
The new RPi-500, whilst a little $$$ does have a NVMe slot built. From experience the RPi5 is quite snappy with a NVMe drive.

"Yep, I have at least 5 or 6 different MiniPCs around here for LinuxCNC testing and general use and none are
line operated, they all have laptop like power dongles (either 12 or 19.5V) "

I thought I had too many PCs & RPi's for testing purposes, but think I might be a little below par.

What you need to do depends entirely on your interface hardware.

What interface hardware do you have?

If this is for a parallel port interface with the particular breakout card pictured,
you would use stepconf  to add a spindle PWM generator to pin 1 for the spindle
analog speed control, and perhaps use the breakout cards relay output for spindle
enable (pin 17)