Thanks for the advice, but I think I'd need a slow-motion video to have a chance of figuring this out.
This morning I did some experimentation. I took as my test cases a short example -- the opening of Lizst's transcription of the opera "Norma" -- and a long example -- Scarlatti K. 141 -- in hopes of stumbling into the right way to play so as to be able to do fast repeated notes without changing fingers. I think there were times when I did stumble into it, but could not prevent stumbling out again. So there does seem to be a way to do it, it will just take practice.