Hmmm... the lens has no visible thread or mount, maybe there is something hidden. If not, I thought about asking help to someone with a 3D printer. The lens weights about 360 grams.
My bellows + enlarger column do not get close enough to get frame filling shots of a 35mm frame, unless I add a tube or something, I guess. They work OK with my Fujinon EX 75mm, which astonishingly seem to resolve 35mm Fuji Acros on my 60mp A7R4, though I will make some more tests to be more assertive about that combo.
I'll try with APX25 and TMAX100 negs to be sure, for instance.