You don't see a narrow currency symbol. We should see a narrow symbol always, and it should inherit from the normal symbol.
To do this, I think we'd need to alter XMLSource to:
add the alt="narrow" form to code fallback.
add sideways inheritance for "alt" values.
The second one we should do anyway. That is, if <path> + [@alt="XXX"] doesn't have a value, return the value for <path>.