these days most SIDS and Stars are RNAV and do not reference am aid.
I wouldn't say 'most'. In fact, in western Europe I would say 'a minority' do not reference a nav aid. The majority of RNAV approaches around here are overlay approaches and while strictly speaking unnecessary, raw data backup is worth doing. That's just my opinion (and company SOP).
As for an approach based on an NDB, I imagine tuning the beacon is standard practice for most people, no?