Yes. It’s been done.
Christopher Penczak, in his book Instant Magick, uses a trigger to take you into the Alpha state so you can perform magick.
I think there is also a thread on self hypnosis that covers anchors as well though I’m not sure.
The state achieved by your anchor, or trigger, will be very light at first, but the more you practice and use it, the deeper the trance state will become.
Essentially, the technique boils down to getting yourself into trance via a countdown or whatever method you prefer, and, once the state has stabilized, make your anchor/trigger and as you do so, tell yourself something along the lines of, “this is my magical trigger. Every time I make this gesture, I will immediately drop into this state where magic happens.” Repeat the statement at least three times, and then bring yourself out of trance. Make the gesture, and you should go back into trance, though not as deep. If you do not, repeat the procedure to program the trigger/anchor.