Apart from chocolate (oh, so, so glad I don't have to worry about this oxalate business) I think I'd cope with it, since no major cuisines are ruled out. You just might need to have smaller portions and fill up on whatever's on the green list, but ultimately that's not a bad thing and could even be healthier regardless of oxalate content.

I would check the Crunchy Nut carefully though - the cynic in me believes there's less nut in it than you think. You might even find that scarfing down a boxful each day has less oxalates than this thumbnail-sized piece of 85% dark chocolate in my mouth, and I wouldn't bat an eyelid if it were true, either.