How can we mod Red Dead Redemption 2 in SteamOS?

I installed a handful of mods for RDR2 last night but none of them seemed to work. Is there a known fix for getting these Scripthook and Lenny's Mod Loader mods running?

I found this comment but when I typed it in to launch options RDR2 wouldn't launch at all. I'm new to Linux so I don't really know what I'm doing. Thanks