So I tried it. T- is right, an hour just slips by working like this. Not only that, but it seems to enhance my mushy memorization skills. After the first hour, in which I covered the first 12 or 13 measures of the Prelude, I was able to play the section from memory, and it sounded much less "square" and better in tune. So I thought I would put it to the test, and shoot a quick video.
OMG! My nerves killed me! This is such a good thing to do. No pressure other than a running camera sitting in front of me, but I felt all the tension of a live performance. Before listening to the clip, I put my observed performance at about 75% of what I had done 5 minutes before. I struggled with the tension in my body and in my face, and I heard all those little intonation errors. I heard them! That's great! And you know what? After watching, I'm still pleased with the outcome, because it is better than it was before. And as documentation of the progress to come, I'm posting the clip here.