Hi, welcome to the forum
Just to clarify: you mean
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a shortcut for moving a (selected) note to another notebook?
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Or you'd like a shortcut to move a notebook (of a selected note) into a different notebook?
Although I understand it is not exactly what you're asking for, the first feature can be roughly achieved via the next plugin
The second one is not possible as the moment, that's true, although in theory, the appropriate plugin can be developed i.e. achieved via Joplin API. The question is only who'd want to do it.