The shaving conversion is not difficult, just make sure to use an aluminum soda can/sheets from a aluminum can to protect the optics, tape against dust intrusion, measure accurately and go slowly.
While I found a trick to force FX mode on the Z8 and set the aperture on the 10.5mm as posted here:
https://nikongear.net/revival/index.php?topic=11224.msg209380#msg209380, I finally broke down and bought a cheap dumb adapter to dedicate to the 10.5mm. I liked the design better than the one in that link, price was $25 lower, but might need to add front/rear caps that do not come with it. The F-mount fit is nice and tight, while the Z-mount side is looser than the FTZ II adapters I have, more the same resistance as mounting the 24-120mm. An Amazon review stated that it has a plastic Z-mount, but I am pretty sure mine is made of coated metal. The register distance seems OK. I was able to calibrate the aperture clicks to a mid range setting of about f/ 5.6-8. The ring has a dampened feeling to it, probably due to generous application of grease to provide the illusion of a precise mechanism.
