I stepped into this post unsure about what I would find. I am not an expert on Unicode, foreign languages, etc. but I've seen a lot of typefaces used on signage so I decided to see what this post offered as far as new knowledge.
I really enjoyed the depth of coverage. All the things that go into making a font that represents a language or culture and allows those who use that language to understand how to parse the characters into legible words.
I think the one thing missing here is to link some of the Unicode characters to spoken words so that the reader can understand how the character or sequence of letters is pronounced in normal conversation amongst native speakers. That would help clarify some of the differences between placement of diacriticals or other marks.
A long time ago (around 20 years) there was a radio program where one could tune in over the internet and listen to a short series called "Native Word of the Day". [0] A listener could hear native speakers pronounce words and use them in sentences so that the context of the exchange made sense. The website had a collection of words or phrases in quite a few indigenous languages and the reader could select a word from a list and hear similar content - the word itself, an example of how it is used in a sentence.
There were several west coast languages, Iroquoian languages, Alaska Native languages, southwestern tribes, etc so one could get a feel for how each group saw the world based on the words they used.
I used the site as a tool for teaching my kids how to pronounce unfamiliar words and to help them understand that there are many ways to look at the world. Seeing things through the lens of a foreign language can help bridge many gaps.
I still remember one of the words (maybe actually a phrase) that I became fond of though I would need to dig through old notebooks to find the source language. It is pronounced kinda like this - new-ahna-go-wab-me though I don't remember the exact spelling or source language. That's probably a crappy pronunciation example so good luck. Maybe someone can find it somewhere.
[0] https://www.knba.org/knba/2014-05-07/knba-re-introduces-nati...
One may find an online station using this list:[1]
[1] https://www.nativeamericacalling.com/station-affiliates/
Anyway, Thanks OP for jogging my memory.