I found the Nillkin sleeve is the best for this. It is a high quality and very accurate moulding which fits really tightly and adds almost no thickness/width to the phone.
Two aircraft grade 2.4mm rivets (with 8130-3 form). I do have a precision adjustable countersink for these but was too lazy to use it, hence…
Looks a bit tacky close-up… would never get my A&P on this (probably would get EASA66 because the paperwork would be 100% though)
Done:
I would put some tape over those rivets … or they will scratch the phone for sure!
