In fact, the vector maps article contains this text:
> (Hmm, reminds me of my noteshrink project…)
...so the author did, in fact, explicitly consider this possibility.
So first article is from 2016, and vector one from 2018, 3 years later there is no explicit article combining two, but I get it if you want it, do it on your own.
I did missed that he mentioned it, but it is still quite interesting as I use a lot GoodNotes on iPad.