Hi,
Thanks a lot: your solution worked smoothly for me!
So it seems it was only a matter of Pywikibot library configuration:
I edited my family module, adding the 'shared_data_repository' method
(similar to wikidata_family.py
https://github.com/wikimedia/pywikibot-
core/blob/2.0/pywikibot/families/wikidata_family.py#L32 );
and, for my specific use case, I also had to add the 'protocol' method
(similar to osm_family.py
https://github.com/wikimedia/pywikibot-
core/blob/2.0/pywikibot/families/osm_family.py#L18 )
Cheers!