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Can you try an espalier? It would be a bit tighter-fitting to the wall (and may not protrude the full 2 feet) but is very amenable to shaping.

Here's a list of potential natives

That is a neat description! I have been meaning to spend some time figuring out the differences. Some of the other pages look interesting too.

The only thing I could add is that the guide I use ("San Diego County Native Plants", James Lightner) describes B. nigra's leaves as "lobed with teeth", and has a close-up of a leaf that looks more lobed than the H. incana.

I'll have to stop off on the way in to work and check out a stand of mustard, if it's still alive. I am feeling pretty sure it is B. nigra now!

If you're on Android, I had some good luck using this app for identification:
https://play.google.com/store/apps/details?id=org.plantnet

I've used it for flowers with success.. I haven't tried shrubs and leaves.