Hoi,
Wikidata is not broken. It is Wikipedia that is a mess. As you concentrate only on interwiki links, you do not see the whole of the problem. The quality of Wikidata is such (not enough statements as well) that seeking a solution like this will not make a real difference.
When Wikipedians consider this an issue at all, they seek instant solutions. By including links and red links we expose the real problem much more effective and work towards more quality for both Wikipedia and Wikidata. After a year fixing the linking problem, we may get to a state where your "solution" may become intuitively correct.
Thanks,
GerardM