The whole "baptism" thing as you well know is just a set-up for the Society to be able to pressure on its followers later on and to keep the masses in line, so to speak. It’s really not a dedication as much as it is indoctrination, IMO. It simply becomes the line one crosses, that separates the before you are a JW and after you become one. It’s got nothing to do with God (this kind of baptism) and is all to do with "legalities" of a cultic religion. Try not giving the JW baptism any more energy than it deserves (i.e. lawsuit). It’s meaningless anyway. Or maybe try thinking of it (getting JW baptized) as helping to make your leaving the Watchtower Society (DF'ed) a more definite reality. After all, NOT being a JW anymore is the best thing for your life. When the elders came to my house to set up proceedings to DF me, (I listened to their pious empty concerns and then) they were taken a back when I told them, "Hey, after you disfellowship me, could you like send me a copy of some kind of document that states that fact? I want to frame it and put in my study on the wall, so anytime I think of joining some other stupid group I can look at it and be reminded of why I don't wanna do that, OK?" Their little JW’s jaws dropped as I disarmed them right before their eyes. It was a beautiful thing. It was a great feeling of empowerment for ME however. I’m not exactly sure how you feel toward the Society. Do you still wish to belong? Do you still have some loaylties? Or is it you just don’t want to loose family members by trying to invalidate your JW baptism and thereby ‘keep’ your family intact? It’s all too late for that now. Even if they agreed to cancel out any meaning to you getting baptized, you’re still dead to them anyway. Look, the Watchtower Society needs YOU, you don’t need THEM. Maybe I’m missing your concerns here. I’m sorry if that’s the case. I just wanted to share a little about how I feel about the JW baptism BS.
When I got saved in 1984 while attending a little church in S. Florida, I got baptized again. But this time it was for my Heavenly Father and not for a man made, man run, my manipulated cultic organization. Do you still believe in God? Then find a little church and go baptized again. It will give a sense of well being and will help you realize how invalid your JW baptism really was.
Good luck to you!