I don’t have much JS knowledge but if you perceive a possible solution in that direction I can dig into it.
Drifting a bit from the original topic, but I’m thinking that my “dream solution” would be to be able to add a button to the toolbar which “adds the user’s spreadsheet” 
Will definitely post instructions and a tutorial, but my community population is very much “the general public”, and even with a tutorial this kind of thing is challenging.