It sounds like the Hutchinson Fusion will be great when they're available, maybe I can hope for them in the spring. Am I reading right that Gravel Kings don't start being tubeless compatible until they're too big?

There has to be another option, this is crazy limiting.

How are IRC's tires? Formula Pro is tubeless and 28 mm, and looks like a road tire.

For what it's worth, my rims have a max pressure of only 80 psi. I tend to run anywhere from 60 to about 75 psi depending whether I'm planning to ride good pavement or something bad. After years and years on a skinny tire bike, that feels like pretty low pressure to em.