Tried it tonight. Was able to simply plug in the hdmi adapter, go to Display settings on the SP3, and adjust the resolution to 1280 x 1024. After watching, unplugged hdmi, went back to Display, and it was already auto-detecting the SP3 native resolution again, hit "apply" and done. Brilliant. Forgot to bring the keyboard upstairs, and managed all with touchscreen.
I was never much of a TV person before. Glad to learn something new.