I think the existing script will work OK regardless of whether the sub-set of contexts is selected by direct CMD-clicking, or by choice of perspective.

A script which offers a list of perspectives, and then sends a text version of the selected perspective straight to Mail without further ado would certainly be an elegant approach, though possibly less flexible than the existing script - It would work smoothly with existing perspectives, but would also preclude assembling ad hoc sets of contexts on the fly.

You may, however, be suggesting one or more single-shot scripts of the form "Send perspective X to Mail", and I can see why that approach might well be useful.