Very cool ideas, do it! I'd be inclined to photograph the TV on large format and contact print that slide or neg. Reason being the flicker and the static, and the issue of how to define the exposure time- the response likely won't be fast enough to define short exposure, you might aim more for 5 or 10 sec exposure. But simply photographing the screen would fix all of these problems easily. I know it's not as cool, but...