Setting can also be a gateway to poetic first person. I mean, the first thing that came to mind was, "Is this going to be a high fantasy or something similar?" because then you can easily justify writing a poetic book in first person... it's just that kind of world.
As for if it's mainstream, then poetic first person COULD be a little jarring to some readers, but there's always that rule of thumb, (paraphrasing) "If it works, break any rule you want." So who cares if the way I'd do it might be jarring, you're a whole other person! (I know, shocking!)
Go for it if it's what you really want to write.