I updated this with a GUI Launcher extension. Because you need to select which game to play, I needed a file selector, so I also ported dialog. It's attached separately in case anyone wants to use it for something else.
I altered the behavior of dialog's file selector to make it easier to use on a touch screen -- you just tap the desired file then tap OK instead of having to use the space key. Otherwise it's the same as the stock version.
I don't know if I like how it looks, but it works.