I’m not sure I understand your setup completely.
But my suggestion to linkhousemedia sounds to work the same for you.
Instead of having all those reports in a single repeater. Split them up so you have a single report as a bunch of fields on a custom post type.
So on this page where your authors work with these. You can output all the posts in this post type for them to view (and you could create a front end editing form as well). And for creating new ones you can use acf_form() to post to your CPT.
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