Hi SerialPixel,
Have you tried implementing some tests to see if this could work for your situation. We do have touch support in the engine through Blueprints and touch events.
A way to test if Touch is working with Windows 8 for you would be to package Tappy chicken and see if you can use the touch screen to control the game. If this isn’t working for you let us know and I can look into this further.
Thank you!