I'm mostly on tubeless these days, but I still have one set of wheels that's tubed, or sometimes. And on those, I've taken to putting ~15-20mL of sealant that I use on my tubeless wheels, into the inner tubes. Pulled a 1.5" staple out of a tire this past summer - spit a bit for ~5sec., but then I rode the 20km home still on ~100psi.
