Andy,
I tried the method you described but all I am left with is just a text outline with video in it over a background. Turning the text face turns off the matte. So while turning off the face of the text turns off the face in the clone the result I am looking for is not there.
I want the face of the text to act as an image mask (matte) which is then applied to a video layer. The purpose of the clone is to act as the text outline. I have tried using a link behavior after making a copy of a text layer only the copy does not match any changes made to the original.
Here is how the layers are stacked:
Text outline
Original text (used as image mask)
Video (with image mask applied)
Background
I have tried using a luma keyer, various color correction methods and additional mattes only to not get the effect I am trying to achieve. ????