Very sorry. I know there is no way to leave JW's in a dignified way.
Just a couple of thoughts from a former elder here:
They don't need you there to DF you. That doesn't mean they will. Contrary to popular belief, there is no uniform handling of these situations. It all depends on the elder body, the CO, the "desk elder" in the Service Dept at Bethel and how this whole thing was framed. I have seen situations where the potential disfellowshipping was held in abeyance, and others where you could be DF'd while not participating in the hearing.
It all depends on how this whole thing was framed by the powers that be.
As a personal opinion, I have never been in favor of going out on their terms. If you are fairly certain that they are going to have it in for you, I don't think you should worry about what they want you to do. It is all legalese bullshit they invent anyway. The only thing that matters is how you would like to go out.
The sad fact is, sometimes faders get busted. If that is the case, I highly recommend putting yourself and your needs above anyone else, even friends and family still in. This isn't a battlefield you can win on. You have to take this battle to another place to win, and that is by reclaiming your life. (which I am obviously unfamiliar with...)
Thanks for reading!