Could federated queries be made possible through the visual interface? E.g. visual interface element that specifies or helps users pick across which instance they want to run the federated query. Related:
- How to pick equivalent item/property across different Wikibases – again via a visual interface, if possible?
- Could the service get a "rebrand" that is more specific to Wikibase than Wikidata, and enable visual "switching" between doing a single query on your own wikibase vs federated queries.