Derukugi

[[I should point out (although I shouldn't admit to knowing too much of these kinds of things ) that 'iyashi' has a usage which is overtly sexual.]]]

Hmm... David... have you been visiting too many de-ai sites by any chance? Yes, "iyashi" is often used in a sexual way, but by no means does it have to. Just as little "beaver" or "missionary" in English always have to be sex words, no matter what Goggle tells you.
It all depends on context. I see no problem with "iyashi", as long as people know it is meant in a medical way.