Karg-Elert, Sigfrid Aus dem Norden, Op.18/2 Elegie for organ

Karg-Elert made this arrangement for organ of the second piece in his Six Lyric Pieces from 1904. Aus dem Norden, From the North.
When I first heard it I thought it was one of the most beautiful, mesmerizing and appealing pieces of organ music I had heard for a long time.
Also it is a perfect piece to play on the OAM 1925 Steinmeyer in Berlin.
This arrangement got me thinking of a new project.
Looking for suitable pieces of piano music by unloved composers that might lend themselves to fairly straightforward arrangement.

Organ score and piano score for all of Opus 18 below.

Aus dem Norden, Op.18 1903 From the north
6 movements:
1. Springtanz
2. Elegie
3. Halling
4. Idylle
5. Novelette
6. Bergmelodie