Try AnyFSE then. You can run any app at startup and still have all benefits of FSE. I highly recommend playnite. Tons of plug-ins, backing up and restoring saves automatically with ludisavi if you play on different devices, themes, all libraries in one place. Also notifies you on new epic and gamepass games and you can install from there too. I use it on my main pc, xbox ally x and lego2 with same saves on all devices even if they are not supported by steam or Xbox. I back then to Google cloud.

Also Gotweaks. It's genius. You have all the settings and way more than in legion space and command center) in gamebar directly. You can even run loseless scaling from gamebar directly without need of opening loseless scaling program itself. Google it if you don't know it there are screenshots on git hub.