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When I was on the hunt I found this list: http://thebicyclewizards.com/index.php/2016/11/23/650b-rimz/
If you want tubeless I think the Pacenti Brevet, HED Belgium or Velocity Quill are the only options. There are a few non tubeless ones though. SJS stocks these Thorn branded rims in black and silver https://www.sjscycles.co.uk/rims-650b-275-584/?type=rim+brake
I ended up getting the Pacenti Brevets in 28h and I am really happy with them.
Is there such a thing as a 650b/28h/Rim brake rim aside from the Pacenti Brevet??