I have DID and have used EMDR with no problems. I found it to be somewhat helpful. I have done it with two ts, both of whom are trained to use it with trauma cases.

They followed a pretty strict protocol which involved doing a lot of "resourcing" before we addressed any issues, and were careful to not let me leave in a dissociative state. One thing I like about EMDR is that I can do it without getting attached to t. And I find getting attached scary.

I also liked that they told me to stop it at any time. That helps with safety for me.

I would suggest you ask about resourcing and try that before targeting any bad memories.