By an adaptor do you mean an extension tube or a close-up lens for the filter thread? I would say do not use a zoom. The 33mm with an extension tube might be your best bet.
I shoot with the XT5 and the 16mm, having brought the lens with me from my previous XT2. The lens is truly excellent - fast and sharp to the edges. The manual focus clutch is a nice touch too (although in fairness, not absolutely necessary). I shoot mostly after-dark and landscape shots and this lens spends more time on the body than any of my others. I don’t think you’d would be disappointed with it
geoff.c got a reaction from Blue Zurich in Thinking about the 16mm 1.4 for the X-T5...not on the "list"