Has anyone looked at this for a spindle?
I do not know if it would mount direct to the z drive
You would need to machine an adapter plate, as current Onefinity mounts accept either a 65mm or 80mm spindle /router body diameter.
fortunately I have a lathe and a milling machine so making a plate is not a problem.
I still have a spindle/vfd for sale in the “For Sale” category if you are interested.