By now it is three months ago I broke my left arm. It is more or less healed, though still very painful and very stiff. I started again playing the organ as a sort of training exercise. Nothing fancy, but a choral prelude with long notes in the left hand part is doable. So this is a good time to start working on the choral preludes by Gottfried August homilius, especially those with the choral melody in the left hand.
I first tried "Wer nur den lieben Gott läßt walten". Homilius wrote a fine piece, a bit more up tempo than most chorale preludes based on this melody.