found your post whilst looking for an rh iatty drip tip adapter on google, so far I've only come across this ss drip tip - too pricey for me but thought I would post it for you I think it's for the genuine one so don't know if it is a perfect fit for the rh one - I don't know much about the iatty other than I love mine
I cant believe no one on here aint made one or even an adaptor ? If I had a tap and die set I wound butcher one of my old Alloy drip tips to see id it worked
Did you find one? I could use a few myself