"The Lair of the Grimalkin" is one such attempt, a sword & planet tale on Venus. Here, Venus is a green Hell here, teaming with a mix of life and chemicals that limit Earthmen to small sections of the planet. But the lush life covers vast mineral wealth, so men repeatedly set forth into the jungles. They just don't come back.
Tempted by riches and the verdant hellscape, Hal has a line on a massive deposit of platinum in the well-named Swamp of Despair, and the story begins with preparations for an expedition that's most likely doomed.
Then, deep in the Venusian Amazon, Hal finds the rarest flower on the planet--a human woman surviving where explorers never did. Her jungle home is threatened by the Grimalkin, a kind of dragon, so Hal decides to play St. George.
But things aren't as they seem, as a failed attempt at killing the alien Great One lands them in captivity, alongside the girl, in a Venusian village. Shaver doesn't bother filing serial numbers off of dragon myths here, so Hal and his companions have to escape--or be dinner. The resulting fight rages across Venus, back to the Earthman domes before the dragon finally is slain, and Hal earns his babies ever after ending.
I was expecting dreck from Shaver, as his memory is quite maligned. This wasn't bad. Frankly, The Lair of the Grimalkin holds up better as a story than Williamson's The Iron God. There's more humanity to this transplanted jungle adventure, for one. Shaver has imagination, to be sure, but he needs an editor. The folksy style doesn't lend itself well to the exposition needed for worldbuilding and Shaver's fascination with making up his own language.
For a man who is derided for his fascination with the paranormal, Shaver's chemistry is surprisingly crunchy. More than one compound and ore that sounded like blatant unobtanium actually exist with the compositions Shaver describes.
There are massive "Lost City of Z" vibes here, which shouldn't be a surprise as pulp was smitten with the real-life adventures of Colonel Percy Fawcett, who inspired elements of the adventure pulps, hero pulps, and the weird pulps.
As a result, I would love to see what Shaver might have done in an Argosy-style adventure. He had the formula and the verisimilitude. But the paranormal and the pseudoscientific were instead his fascination--and his reputation among the "notables" of science fiction fandom suffered for it.