Nun komm' der Heiden Heiland BWV 659 on harmonium

In preparation and anticipation of my (one manual) harmonium to come from the organ builder's work shop I have looked into music that would be possible to play on the harmonium with only slight modifications. For example I have discovered that BWV 659 (the famous Nun komm' der Heiden Heiland) for organ would be playable on my harmonium. The only problem arises at the end:

The G in the pedal is impossible to play together with the left hand (my fingers are too short). I have tried to play the G an octave higher, but it takes away the edge of the music. Suggestions, anyone?