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You can bypass it and use an external driver, which would be the easiest option if you’re not confident desoldering the ob-board one
This is well-documented in the documentation
You can connect external drivers to every port, so do the same for your 4-wire motor on other port
You would be better off to use a 12V supply for the laser. It’s probably cheaper than a DC-DC transformer.
The PWM output will be fine to use to control your laser, but you will need to have a different set of operating PWM parameters than you would for a spindle. Your LED laser (I presume) will be expecting a different range than your spindle.
This may help: https://jtechphotonics.com/?page_id=6798
You don’t need to create a UI – there’s plenty out there to use.
Do you want to dedicate a computer to the job, or use a microcontroller or SBC like an ESP32 or Raspberry Pi?
If it was me, I’d buy a cheap Orange Pi clone and run some sort of GCode sender, like UGS: https://winder.github.io/ugs_website/
Load your Raspberry OS, load UGS, connect, send.
Doesn’t get much easier than that.
I would question the use of a TinyG for such a trivial task. A $10 Arduino shield would do the same job.
