It's a lot more difficult, because the pubkeys are hidden behind hashes, so without the owner's cooperation you would have to use ZKPs of SHA2 and RIPEMD hash preimages, which is very expensive/complex comparatively.
Discussion
Is there a how to somewhere to be found? I'd like to try this for a possible usecase of mine. Maybe even a ready script? Would pay for it.
Yes, the docs of the repo explain how it can be done (the readme links to auditor-docs at the top).
It's a pretty involved process, for several reasons.
I'm looking into building a GUI right now.