Hi there,
we considered doing hypnosis for a while, but in our system the biggest chance of switching comes
when we close our eyes, especially meditate or go into a trance.
It really was quite funny when we had a counselor telling us to "live in the present" and to "meditate" to feel better
and when we tried to meditate someone else came out

Living in the present only works when you have already processed
significant trauma!
Talk it over with your therapist, because it's quite possible someone else will wake up when you're doing
hypnosis, and if the person doing the hypnosis isn't trained to deal with (The one I talked to wasn't) or doesn't believe in DID,
they could probably cause some harm.
Also, information comes to you at a rate you can handle it. If you force it, it can hurt sometimes. I remember my alters
were prodded for information at too fast a rate they were comfortable with and my whole body went into shock-
Everything went cold and numb and we could no longer move our body, and it stayed for about an hour, then we had
to be almost carried. We then forgot what it was that caused us to go into shock in the first place!
If you go into a deep hypnosis, you may remember some things, but you also have to ask yourself "Am I ready for this?"
If you don't feel comfortable don't do it.
Just some things to think about when considering hypnosis. I don't know much about EMDR though.