When not using a signing certificate, but a (pure) signing key only, some 'bogus' certificate information is injected from pymdoccbor/settings.py.
It seems a bit awkward to moneky-patch these by (programmatically) overriding pymdoccbor.settings.X509_COMMON_NAME and similar.
It would be good to have a 'proper' interface for these to set, and thus not having a dependency on X.509 certificate compatibility.