Here's an idea, but I don't know if it would work but here it is:
Take a file you like with a trigger but instead of a trigger word or phrase, make it a song. That way your favort song triggers or trains you just by hearing it, or have it deeppen the effects of a trigger word or phrase.
I don't know if it would work or how it could be executed without the aid of a another file, but I think it would work. After all, is it easier to listen to a 3 minute song you like or a 20-40 minutes hypno file?