It's a little clunky to get going right now, you'll probably need to launch Cxbx in advance so you can configure controls (and other settings), and then close Cxbx and run my launcher to actually start playing, but it does work, and you can indeed play around with what I've done up to this point. It (obviously) requires a copy of Burnout 3 for Xbox and the latest version of Cxbx-Reloaded. It only compiles for Windows, but runs well in Linux with Wine (use winetricks to install vcrun2019 and d3dcompiler_47). It's available here (binaries can be downloaded from the 'Actions' tab if you have a GitHub account). The good news is my launcher is pretty much ready.