FYI, after 2 years of break, I got back to working on Gedcom 7. In the last few days, I worked on a library which can form the basis of a new Gedcom 7 import addon. It is written from scratch and does not attempt to parse invalid Gedcom files.
This is not ready for testing, but wanted to announce it early in case somebody has input.
It is an importer only. You you can hand install. But it is still experimental.
And until Gramps has its data model changed to support GEDCOM7 features (or has standardized on how to store that data as custom types), GEDCOM 5.5.1 export is still the lowest common denominator.
I don’t know, but this snippet in the Gramps source code seems to imply it is possible to use pip. Only that this snippet will not work in this case, becase the module name (gramps_gedcom7) is not the same as the package name (gramps-gedcom7), which is what is needed for pip (see comment in the draft PR).