If you want to stay with tubes, some folks put tubeless sealant in tubes. Just remember you'd probably need to swap tubes often enough the sealant doesn't harden and pop the tube when you re-inflate it after the sealant has hardened from a long period. I bought used wheels off a guy that did just this and I didn't think to swap the tubes and popped a tube, sealant in them was done for.
But it's a popular option.