Piano accompaniment for Arban solos?

[imperialbari]

I use the big red US-edition for trumpet/cornet for all of my brasses. The solos have cue notes for piano and there are long rests making no sense if it weren’t for an accompaniment.

Not that I am going to conquer the big stages Florence-Foster-Jenkins-style, much less John-Jenkins-style. Yet my rotten ears got an idea for a setting for low brasses of one of the variation pieces. I wouldn’t stick to the original chords all the way anyway, but having the piano part still would make a lot of passages easier to set.

A transposition fitting the cornet part would be all fine, but where to find it?

Klaus