That’s what I would do.
M.2s are dirt cheap. For Nucleus OS, you probably don’t need anything bigger than 128GB, but get a 256GB to be sure.
I would get one that has some heat mitigation built in ( I suspect the M.2 deaths on Nucleus have to do with heat) or add heat sinks to whatever you get.
If you take it to a dealer to fix under warranty, they’re just going to send it somewhere and who knows how long that will take. They’ll probably replace the M.2 with the same sh&tty brand as the original.
OTOH, opening the case (to replace an M.2) will probably void any warranty you might have. Dunno.
If you do replace the M.2 you then need to download and install ROCK, which is easy enough. Once ROCK is installed contact support and they will update the OS to the Nucleus OS. See this post.
You might want to wait and let @support have its say about this and other things.