I'd say the Incal is fairly close. The Metabarons is a spin off to The Incal also written by Jodorowsky. The tone is different and it's more Blade Runner than Dune, but the Metabaron is a character in it and it may help with understanding the Metabarons a bit.
There's also the other spin off, the Technopriests, but I've not read it (it's sitting on my shelf however).