I can't imagine why anyone would bother to try to get a sweet almond from a peach tree. Peach and almond are related botanically - the pit inside the stone of a peach has a bitter almond like flavour, and these are often extracted and treated, ground down and used in products like exfoliating scrubs. They contain cyanide, but eating one or two won't kill a human - if used in manufacturing for any food purposes, they are heat treated to destroy the toxin. So far as I'm aware, and according to my research, no one is attempting to get peaches which contain sweet almonds inside the stone, which itself is very hard to crack open.
UPDATE: What I meant by why would anyone bother is, other than its appeal as a novelty, who would buy the resulting trees? Growers of almonds want just almonds to sell on - commercial peach growers might grow such a thing, but probably most people would rather pay less and have a peach than a peach/almond. And in the garden, I don't think I'd want to eat 6 peaches just to get my 6 almonds a day, that is if I got any peaches in the UK anyway. So if there is a market, it wouldn't be a particularly large and lucrative one, was what I meant, which is probably why breeders haven't spent a lot of money and time trying to breed one.