just clone yourself, or save a copy of your consciousness at the point of departure? and if you don't like the idea of that then cope and seethe and die from a trivially solvable issue.
well it can suck my dick because i don't care if i end up 5 atoms different, i end up 5 atoms different every single day anyways. There is no amount of identity crisis stuff you can throw at me that i cannot simply counter with "well i don't care, that's fine".