The only success I had with tubeless on the old bikes was "ghetto" style. Get a 24" tube and stretch it around the rim. Split it open and mount the tire and see if it will air up. If it does, add sealant, air it up and do the stan's dance. After it sets overnight trim the excess tube along the rim with a razor knife. It usually permanenlty bonds to tube and tire together by the time the tire is worn out enough to replace.