By tidying up in my library I found this score and decided to try to play it. Beethoven didn't write a lot of pieces for the organ. When Beethoven was a student of Albrechtsberger he wrote 15 fugues. I propose you the nine first. I don't know if he intended them for the organ, but it works. Of course, that's not the great composer that you can hear, but the young student. It's more a curiosity.
The Weissenau organ was for me the best choice to record this music.