Hoi,
The interwiki links to Wiktionary are from an interwiki point of view EXTREMELY easy to do. The problem with those links is that they cannot be uniquely linked to existing items to Wikidata and thereby it becomes unrealistic to do it in a meaningful way at this time.
Wiktionary has one article for multiple lemmas in multiple languages and they are based on the way they are written NOT on being about a subject.
Query is not the only thing that is missing ... Commons is more acutely felt to be missing than Wiktionary.. PLEASE DO NOT PROCRASTINATE and do something that is "nice" because someone proposed something similar. First get the job done and first make Wikidata usable for my siter, my mother in the way that Reasonator is and Wikidata is not. Please consider monitoring the use of Wikidata... More relevant than Wiktionary at this time