Couldn't get the MP3 to work (my system is old and I was planning to get a new computer in 6 months until I got laid off my job recently).
You are correct with 61 - 80 the chords could work with proper registration. As long as you have a good performer who could maintain a clean articulation at the tempo indicated and good registration skills it would work.
I do like your idea in the A section - I just see much more possibility.
Just to be fair below is the link to the organ piece I wrote and posted awhile ago, select the premiered work. So, listen before taking to heart all my critiques.
Listen