Well exactly. My personal prejudice is that tubeless is more trouble than it's worth, but that's just me.

Whether it's tires or plumbing problems or oil leaks on Porsche engines, when I hear "Sealant" proposed as the solution, I aint buying it.

Something is wrong and it feels like the OP's technique for tire mounting may be the problem.

People struggle with snapped tire levers. As FBinNY said, you should be able to mount just about any tire without tools. The trick is to get the tire beads - all the way around - down in the rim's "well" so as to give enough slack to get the tire into the rim. if you are struggling, something is wrong and most likely it's that the tire bead is up in the bead seat area of the rim.

/markp