The plugin will have to do some caching of the cite keys as the .bib/CSL JSON updates. Hopefully the Plugin API will have hooks to the completion UI/logic for the current link completion, then the cache can be used there. That would satisfy the idea of the cite key as being a node as well.
I have to mention though that pandoc-style markdown citations are [@key] as opposed to [[@key]]. So any export functionality should provide an option to keep the one pair of brackets I guess (there is a thread over at Feature requests asking for a way that automatically removes both the pairs of brackets on export).
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