I don't see difficulties if is made sure, that two additional fields belong
to every information in Wikidata: a license field and a citation field,
with the regulation, that one of these must be filled, otherwise Wikidata
does not accept this edit.
Which of the both additional fields is filled, lies in the responsibility of the editor.
In addition it must be provided, that it is impossible to take over
any info without such - filled - additional field into any Wikipedia.
dr.cueppers
de:WP
Dr. Cüppers GmbH
Hübnerstraße 2
33104 Paderborn
05254 935700