Interesting approach, I had thought about doing something like that, but then I just went ahead and bought a Centroid Acorn and DMM servos. Very easy conversion, except for having to cut out the casting to get to the Z motor. I had to buy a bigger angle grinder to get thru the thick casting. Still need to put the new Z servo in...

I did replace the Mikini BLDC control after I accidentally shorted it out.
I bought a new BLDC drive, but I still have the Mikini motor and it works fine.

The second Mikini I bought was converted to parts from CNC4PC, but I'll go ahead and switch to Centroid so it matches my existing Mikini and Hardinge Accuslide (also DMM servos)

I tried Mach and found it to be very difficult to use. The Centroid software is great and actually makes sense to me. It's more like the Haas and Fanuc controls I ran before I retired. BTW I was a prototype machinist for 42 years and design engineer for 20.