In theory, yes, you could replace the spindle driver board with something else. Then you need to change out the spindle drive motor too. There’s a PWM output that goes to the spindle board to set speed (GRBL outputs a PWM signal to control speed - superpid can work using that pwm output from the main board, for example, and that’s how you would do it on a shapeoko). That said…not much you can actually mount on the nomad z-axis. There is a slightly more powerful motor (+20W) available that you can refit in there without too much hassle…but it doesn’t really make anything better, I wouldn’t recommend the hassle. Done it, not that exciting. Nomad spindle motor....upgrade?
So, practically speaking, you’re kind of stuck unless you can find/build a motor/mount assembly.
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