Googling "eltse" reveals a lot of talk about it. Mostly in the US, and mostly saying it's wrong because there's no t in the spelling, which I would never do, of course. Spelling pronunciation is increasing but I can't see it going the whole way and I don't think we can insist on it. Interestingly, one of the first sites to mention it references Labov's research and "intrusive t". I've heard it for years out on the tough streets, of course.