Formality in AAC would be user dependent too. Like buttons to hide or add when customizing, but people will joke with the wrong formality level or put people in their place with specific forms. Some families use the formalities/others don’t. It is more intensive to basically make 4 of the same page, but may capture language use better. Depending on the language!
In a list of Korean core words by Shin& Hill 2016, there are at least 2 politeness levels.
I know $12 USD is a lot of money for some people, so to celebrate 1000 sales, I'm giving away 1000 copies of The Pocket Guide to Debugging (honour system: please only use the free link if you can't afford $12!)
Here’s the link, use code BUYONEGIVEONE at checkout to get a free copy https://store.wizardzines.com/products/the-pocket-guide-to-debugging-pdf
(I can't disable the billing address prompt but you can just enter a fake address like 123 Fake st, new york NY 12345, (123) 123 4567 :))