Though I doubt anyone just jumped in there with needles, yarn and project idea in hand awaiting how to do this; BUT if there's an interest I am in the process of uploading video 6 which shows the thumb gusset increase on row 7 using M1R (or M1B as Amy likes to call it) and a M1L (or M1F per Amy again) rather than K1F&B as calls for in the instructions. Using k1F&B didn't look right with the color change at that point too.
Obviously there are great videos here which show exactly the same thing I'm doing, but they don't have the color change dilemma that this pattern introduces.
I have to leave (37% uploaded), but it should be easy enough to find the video without the direct link.
Marlene / DetroitKnitter