Salsa works nicely in noodles. There is a whole range of asian noodle dishes. Sesame noodles comes to mind.
Do not dismiss spicy foods just because he is a little boy. While it is true lots of kids do not a lot of kids like spicy (just like adults) there are plenty who do. My daughter eats fresh grated horseradish like it is ice cream.I think OP's son is a little boy... spicy foods might not be his forte just yet...
Sorry, JP, just realized you suggested the same thing!
Jeekins, egg noodles contain flour. So far I haven't seen a rice noodle version of egg noodles, but who knows......