It would be cool to be able to cross over to helitrox without going through the whole helitrox course. But, I'm obviously not an instructor or trimix diver so I dont know if a student would need to be watched on a dive using helitrox since they are already certified for deco, like a nitrox course for an AOW diver.
See my above post. 4 dives are required. It’s not like your basic Nitrox course where you don’t need to do dives. More involved.