Can I re-run an azd template on an existing templated codebase to update it?

[TWolverson]

The azd standard templates have changed a fair bit during development - this is expected, and not in itself a problem. Suppose I have initialised from a solution template a couple of versions ago, made some customisations, and now I want to automatically update my solution to match the present version's conventions so that my existing project and any future projects I start with azd are consistent. Is there a defined approach to doing that? Running azd init again errors:
Error: environment already initialized to test

which makes sense.

If I could pass an option that tries to merge the current version of the template into my (source-controlled) actual solution, ensuring changes are staged, that could be workable.

[aaronpowell]

To a degree, this overlaps with the feature I proposed here: #1056