Bit of a bump here, but have you ever tried normal tyres on your getto rim strip ?
Iv got stans ust rims but did run a rim strip on my 517 before that, of course at first I bought the tubeless tyres but after slashing a side wall coming down snowdow I stuck on a standard conti, results are amazing. Super light and fast. Holds pressure for weeks. Cheap..
All the conti tyres iv tried work well some others.
But yeah tubeless really is the way.