what you are suggesting would be absolutely tortureous, to me, and I suspect any person who's LL is PT, and has been "denied" for so long. Kind of like forcing a diabetic to work in a chocolate factory.
I know that when I was in Karen's boat, I not only didn't initiate, I avoided any form of PT, because it was such a painfull reminder of what was missing.
on your assertion of being "guaranteed to fail"...well, no, I don't think its a guarantee at all. Like I said before, some people can tolerate a lot. Look at Sandi and her H; they've been at it for 40 years. do you really want to bet on when they're getting D? I don't.