The Sta-Tru TR30 rim offers a 30mm tubeless ready inner profile with rim brake compatible sidewalls.  Offered with different hub options, these wheels might just be what you've been searching for.

The Sta-Tru TR25 rim offers a 25mm tubeless ready inner profile with rim brake compatible sidewalls.  Offered with different hub options, these wheels might just be what you've been searching for.

The Sun Rhyno Lite is a known rim. It has been known for decades.

The Sta-Tru TR21 rim offers a 21mm tubeless ready inner profile with rim brake compatible sidewalls.  Offered with different hub options, these wheels might just be what you've been searching for.

The BWW V-HD with Shimano Alivio Disc mountain bike wheel set is both V-brake and 6-bolt disc compatible.