Arden Vul looks like it could be an amazing campaign, but it would be hard enough to run in 1e/OSRIC due to the sheer size of the thing and the amount of background lore.
I'm usually very amenable to running whatever people want to play, and I've got lots of experience converting things into different systems (currently running Zeitgeist using Fate Core, for example) but I'm breaking into a cold sweat at the very thought of converting something that size into GURPS.
Not that I'd be qualified to do it, since I've never played GURPS. However, playing something / anything using GURPS Space is on my own bucket list. Ideally an Expanse-style campaign that's restricted to the solar system and uses as little "superscience" as possible - doesn't have to be the actual Expanse setting.