I'm struggling to think of a scenario where the best Y seat would be preferable to an F seat. That said, on the off chance that you would clear a CPU on any given route, I'm quite certain that whoever else stole your original much-coveted seat (presumably in E-, since you're also interested in giving up status entirely) would be happy to swap with you. The GA may well suspect insanity, but would probably help facilitate this if you asked nicely.