It may be possible to get the proper finale music after all.
German channel Kabel 1 Classics is broadcasting "Once Upon a Time in The West" on August 8th, 10:15 PM local time, so it should end between 00:30-01:00 AM.
Could anyone who lives in Germany or has access to Kabel 1 Classics record the telecast and see if the finale has the proper music?
http://www.kabeleinsclassics.de/spielfilm/spiel-mir-das-lied-vom-tod