The SN30 is about as close as you can get to that, I think. I have two, and use them for everything. They're basically SNES controllers with analog sticks. No paddles or other macro buttons. Just ABXY, dpad, start, select, shoulders, triggers and sticks.
They do also make the Micro, but that might be too tiny even for a child. Dpad and face buttons only.
Looks cool! Piques my interest in the same way as Nox Archaist -- getting to experience gaming from a time before me, but with some of the rough edges sanded down.