CachyOS tend to offer their own modified kernel, for gaming optimization, if I remember well. You may not be running the correct kernel.

When you look at the installation guide of the linux-surface github, there are steps for several distros. Do you plan to use your surface for gaming mainly, hence the reason to install cachy or do you plan to use it for various tasks? It may be easier to make it working on a fedora or, if you really want an arch based distro, on arch.

You can already put your PC games on romm and your saves. You just download the game in gog and put it in romm in the windows or Linux platform (I think there is one for mac games also). If you already have romm installed, it might be easier to use it than to have a second service installed.