Alternative bottle cage for range extender?

I have 2 bikes with X35 motors. But only one Mahle range extender. I am trying to find an alternative to the ugly overpriced Mahle bottle holder to fit to the second bike so that I do not have to swap the OE holder between bikes. Has anyone found anything suitable?
 
@youngoldbloke

I saw on another forum that you ended up using the Blackburn Outpost?

How has it been?

My ebike places the Extender under the downtube and I wanted to use the Blackburn also. Though, i wish I could easily remove the cage without have to unscrew the bolts.

Thanks!
 
It works really well. The extender battery is held very firmly. As I posted on the other forum you need longer straps (400x25 mm) than those supplied with the Blackburn Outpost.

cargo 2.jpg

cargo 1.jpg
 
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