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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)

"Yes the RPi5 requires an external PSU (does that really need to be mentioned ?) but some mini PC's require an external as well. Lenovo is one brand that comes to mind, I think the power blocks are similar to the Laptop power blocks."

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)

The extra money would only be spent & wasted. (VB\Jack Daniels doesn't agree with my head, women are way too much hassle and I'm way way too decrepit for the the Circle Pit or Wall of Death nowadays ).

Must try to remember I'm not 18 anymore.