You can seal spoked rims with ordinary silicone caulk, install a valve, and run tubeless. Did it on a 72 Guzzi Eldo 6 or 7K miles ago, no issues whatsover. Loses air a lot slower than with a tube.
Yeah, I know the safety precautions. But I was running the same tire before the switch. If it didn't have the right bead profile to fit the rim, getting rid of the tube isn't going to increase the danger that I can see.