I gave myself an hour to prototype something for a client a month or so ago:
https://www.youtube.com/watch?v=9c_Xa0gKWu4&list=UU2I5SfmbGwswHAzmdqoOHSQ
This is just the Flexible content plugin, with a bit of JS+CSS to make the content of each sub sub flex content field appear in a model window.
I can share this code shortly if anyone wants it, though it is pretty crude JS and CSS that probably is full of bugs (not tested at all). I can’t dedicate any more time to it but it might make a good starting point for someone else?
Dave.