I've been using Lutris for this purpose, so that's another possible method!
- In Lutris, add a new game, search "flashpoint", and follow the provided installation steps. This will create a new wineprefix for flashpoint games.
- Add CLIFP to the wineprefix you just created.
- Configure Lutris to launch the game you want.
- To add a new game, copy the launcher in Lutris and set the copy to launch a different game in the same wineprefix.
- To add to steam, right-click on a lutris launcher and "add to desktop", then right-click on the desktop icon and "add to steam". You can now remove the desktop icon.
oooh, this would be SUPER helpful; most of what I want is available as a flatpak but for the few things that aren't, nix would be a great tool to install user apps without messing with "valve's area".