DT Swiss and Swisside do it on their ARC/Hadron rim brake wheels for the rear.
You could also get this hub:
https://www.blackcatwheels.ch/p/shop...p188889980&m=1
The geometry is optimized for triplet, unlike with Bitex's 8:16 hub. Pretty light too. I'm curious as to whether this guy is still active lol.
For rims, afaik any 24H rim with sufficient spoke angle tolerance will probably suffice? I bet Light Bicycle could do something special if you asked.