I started looking into making a reusable field group field after my last comment. Testing and research turned into an entire weekend and at the end I had created my own version of a reusable field group field.
It only works with ACF5. It works by rebuilding field groups that include a reusable field group field ans local field groups which override the original field groups. The reason it only works with ACF5 is that
acf_local() is not available before 5.
I have not completely tested it and would be interested in feedback or bug reports. I’ll also answer question. There’s not documentation yet, mostly because I think that the instructions when creating the field are pretty self explanatory.
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