I thought this was a slog, though that's a view partly influenced having to do it in discrete bits in a messy weekend. An awful lot of variables in the cluing and (especially) in the alternatives for the changed letters in the across words where, as far as I could tell, only one resulted in a single letter alternative. As well as the correct (and, ok, yes, amusing) answer. there were several possible collections of words which a fool in his cups might burble, and there was the temptation to stop there, thinking you had AN answer - and you all know how I feel about that!
Accepted the "person" was almost a gimme, and I had no chance with many of the clues until I was able to reverse engineer: the down wrong letter words were easy enough with an electric dictionary. Possibly because of the requirements of the "wrong" letters, I thought many of the clues were a long stretch. And i've tried a few permutations on the title without joy. Not a big fan, I'm afraid. Sorry.