best way to deal with the riveted rims is to squeegee RTV or PlastiDip liquid rubber around the depressed center of the rim, cover the rivets, also a good paint job externally, I've always run tubeless on the riveted rims without problems
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics