There are very few UST 29er tires, so even with UST rims your likely to use "Tubeless Ready" tires that require sealant. Latex based sealants do dry up though 6 weeks seems pretty short IME. My homebrew easily lasts all summer (3 months +). There are also some alternatives such as Slime Pro Tubeless and Bontrager SuperJuice that has been reported to last longer.
The Stans Arch/CK combo would be a solid choice, built up with some DT Supercomps. I would switch to Hope hubs to save money before switching to Velocity or DT rims as they are not specifically designed to run tires tubeless like the Arch.
The Stans Arch/CK combo would be a solid choice, built up with some DT Supercomps. I would switch to Hope hubs to save money before switching to Velocity or DT rims as they are not specifically designed to run tires tubeless like the Arch.