I am just curious. Is it possible for a rated player to quit his association with FIDE and start afresh, as an unrated player?
I found FIDE regulations 7.21 which state:
Players whose ratings drop below 1000 are listed on the next list as ‘delisted’. Thereafter, they are treated in the same manner as any other unrated player.
This sounds like a "reset" to me.
Note that this is different to an inactive player which you become after not playing rated games for a year. However in the case of inactive players you retain your rating.
Other than this "delisting" I don't think there is a way to lose your rating.