I would definitely take a look at the new RQ quick-start. There’s an included adventure, “The Broken Tower,” that on the surface seems like a standard one-shot fetch-quest, but the details are “Glorantha” enough that I think someone expecting a D&D-style scenario will be surprised. I.e., the PCs are mostly part of the same tribe, what they are searching for is a mundane-but-important community resource, and the Big Bad is something that can be dealt with in many ways, including a cult-focused, bronze-age-y one.

Disclaimer: I’ve have on read it, not played it.