Enhancements in other forks
There are a lot of enhancements in https://github.com/PyYoshi/uchardet, and probably other forks which have arisen over the years.
https://github.com/search?o=desc&q=uchardet&s=updated&type=Repositories shows how many there are.
I created https://github.com/PyYoshi/uchardet/issues/5 .
Some scouting about in other forks should also be done to try to bring the patches under one roof.