Yeah, there must be a lot of hub-bub about your letter in WTS legal & service now.
Their primary, well, exclusive, concern is how it will make them (the WTS) look if they announce your name as "no longer a JW" and you end up being elected and might influence some political decisions that affect their work, even if it's just local. They don't give a hoot about you or your lifelong service to them, it's all about "how bad might we look?"
Actually, you wouldn't have even had to write the letter, they would have considered you "disassociated for non-neutral activity" or whatever the official term is. Of course, 99% of the time, that is only used for people who are caught voting or join the military.