I've been trying to get this working, but have encountered a wall, wondering if anyone has it working currently through some magic?

The mod in question is the DLSS-G -> FSR 3.1 FG mod ("DLSS Enabler"):

https://www.nexusmods.com/site/mods/757?tab=description&BH=4

Basically for games that support DLSS-G (frame generation part of DLSS 3) like The Witcher 3 next-gen, it replaces it with FSR 3.1 FG.

I have successfully gotten the mod to replace it in Witcher 3 Next-Gen (GOG), following the instructions, looking at the logs and diagnostics. It is suddenly available in the game menu, and it correctly forces Nvidia Reflex on and disables vsync and frame limits. So far so good.

The issue isn't the Frame-Gen part - the problem is enabling DLSS with this mod on. As soon as I load into a game with it on, or turn it on in-game, it softlocks, crashes, and I need to tty my way out killing the game. It is easily reproducible by toggling DLSS on and off. Without this mod, DLSS works fine.

My relevant specs: PopOS, X11, 32gb ram, Ryzen 7 3700x, Nvidia 4070 Ti Super 16gb, Nvidia drivers 550.67, Kernel 6.9.3, Heroic Flatpak/Lutris flatpak/deb,wine-tkg 9 (most recent through Protonup-qt, but wine-ge-8-26 also works with FG somehow despite Wine 9 apparently needed for FG), Mod installation: using winmm.dll (version.dll didn't work, but dxgi.dll method works too)

This mod should work, and there are many reports and YT vids about it working on Linux too with Witcher 3 and other games, dating all the way from 6 months ago. Was there since some update/regression that broke things somewhere?

Any ideas? Does anyone have it working currently? Please help :)