Could faithful adaptations of ERB's Caspak novellas be made?

ERB's Caspak (Land That Time Forgot, Caprona) Trilogy is really a novel composed of three fairly lengthy novellas piggybacking off each other. The Land That Time Forgot the movie is a largely faithful adaptation of the first novella while The People That Time Forgot is a poor attempt at filming the second and third novellas (The People That Time Forgot and Out of Time's Abyss).

I wonder if it would be possible to adapt the remaining two novellas faithfully. Certainly the Weiroos--the primary villains of the third--might need some modification, but the volcano-worshipping samurai weren't exactly a great replacement for them. Having Caspak explode and sink at the end was a ridiculous plot device dragged right out of Son of Kong and served no purpose. In the original novel, Caspak still exists once the expeditions depart, making me wonder exactly what the screenwriters were thinking.

Unfortunately after a rather good first entry effectively converting the first novella to screen, we get a disaster of a movie that piles on cliché after cliché, makes a mockery of its predecessor, and captures none of the wonders of the source material.

Requiescat in pace, Krystle Papile. I'll always miss you.