Hey Garry,
this is a rebranded Mafell FM 1000 PV-WS. Unfortunately, Onefinity does offer no universal Z assemby, that would allow you to attach it to the Onefinity. And it would be necessary that the Z slider is able to protrude downward beyond the lower end of the Z travel which the Onefinity Z assembly is unable to.
A 43 mm “Euro” mount for the non-quick-toolchange version of such milling motors is requested but still no answer.
Welcome to the forum!