> Maybe the org-make-toc package can help you with what you're looking for:
> 
> https://github.com/alphapapa/org-make-toc
> 
> You can choose a heading on every document to contain a TOC. And then link each heading via org-transclusion:
> 
> https://github.com/nobiot/org-transclusion

Thanks for the suggestion, will try it out, but looks like a lot of 
manual bookkeeping is involved.