Nadavmil,
You are right in that very few windows games will function with just a touchscreen as input.
I have found that the best solution is to use bluetooth devices.
I have a bluetooth gamepad, mouse and keyboard. All of them connect without cables and work passively until you decide to use them.
I have found the Teclast Air 3G to be a resonably powerful Windows gaming platform.
I am surprised that I am able the play Skyrim on my tablet comfortably.
Good luck !!