A warning in advance: although I consider the instructions pretty straight-forward, you are going to be doing some things that others would consider "rocket science." Don't cry to me if this procedure melts down your machine, house, or domesticated pets.
I just did the procedure myself, and it works. It's not necessarily pretty when launching, but nothing 'breaks', and the overlay works (I PM'd Ruv and Ingmar in-game to test).
Just a little something in case you really need your Steam fix while in-game.
"Those lights, combined with the polygamous Nazi mushrooms, will mess you up."
"Tuning me out doesn't magically change the design or implementation of said design. Though, that'd be neat if it did." -schild