The Triton is definitely not compatible with the Nautilus. Triton uses the same size coil as the Atlantis, both considerably bigger than the Nautilus.
As far as I know, an RBA was only produced for the Nautilus for a very short time, a long time ago. It would take some dexterity to build it, kinda like some of these AIO RBAs that are around these days. They're so tiny you need really good eyes and a lot of light!
Good luck with your search!