Since you're buying tires anyway, see if you can find a set of 22.5" tubeless rims. There's a 22.5 equivalent height tire for just about every size of 20" tube type tire out there. We used to use them interchangeably on dual wheel tandems, a 22.5 and a 20" side by side on the same hub.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!