What crankset do you have? With a 32t small ring, i would figure you have a bcd which would allow you to get a smaller inner ring. Thatd be a cheap way to get smaller GI.
As for the cassette you asked about, i havent used it but i looked into it when i built a gravel bike. Everything i read showed its a quality cassette and not 2nd fiddle to shimano/sram.
I dont know sram components well- can your rear derailleur handle the larger cassette?
Also, sweet bike. Really cool.
As for the mentioned concern that the cassette is trendy and not widely available...thats true. But in the extremely rare chance it breaks and younare in Wyoming, then just get a different cassette. Your drivetrain couldnhandle basically any 10sp smaller than the sunrace cassette, so if a store in BFE Wyoming only has an 11-32 cassette then get it and go. The gearing wont be nearly as convenient, but itll let you ride.