"Basanova specialized in green curry ramen, a clever adaptation of Thai flavors to Japanese tastes. It was fascinating to slurp, at once vibrant with the heat of chilies and the aromas of lemon grass and kaffir lime, but at heart a classic Japanese ramen. You won’t find this in Bangkok."
I'm not a stickler when it comes to fusion, but green curry soup noodles aren't found in Bangkok because they're not a very good idea. Green curry, in fact, isn't found in any soup whatsoever, because it is a thick coconut-based curry, and not a soup. A small amount is eaten atop rice, because it is rich with coconut cream and very spicy. Trust me, if it was tasty to eat a whole bowl of it, the Thais would be eating green curry soup noodles all over the place; this definitely isn't a cooking culture bound by orthodoxy or health concerns.
Green curry is found atop kanom jeen noodles, though, which are soft and sweet, cool and springy - not unlike soba - which, dare I say, would make a much better medium for a splash of green curry than a huge, steaming bowl of ramen.