Maybe look into slime smart tubes - Inner tube filled with the sealant basically.
They last longer, there is no zero mess or hassle and does exactly the same thing minus needing tubeless wheels & tyres which are expensive.
Not sure if people don't know they exist or aren't keen for some reason but they've been golden for me.
My understanding is that tubeless is not really about saving weight, but more about the tyre being allowed to conform directly to the surface as it rolls over. If you introduce any type of tube, the main advantage of tubeless is lost. You'd only be left with puncture resistance, which I suppose is a benefit, but when you're adding additional rotating mass in the form of tube and sealant together, theres quite a downside there.
Thats probably why they haven't seen much in terms of wide adoption.