Great idea
Definitely worth a try IMHO. Taking aside the inevitable comments about the female presenter, I think the key thing about the presenter is that they are really professional and engaging. Perhaps use more than one for a bit of variety (no comments please!). I've bought a few DVDs and tried CBT for the PPL. I found it was dire. Amateur presenters and boring monologues. I went back to the books in despair. However, when things are more engaging, it definitely works well. Others may disagree, but I enjoy Mr King's DVDs even if he does break the world record for the 'most frequent use of the word "Fun"'.
I think the proof of the pudding would be to do a test video explaining the whizzwheel. If you can make that interesting and engaging, then the rest should be a cynch!