I do the same thing but worry about a nation state or rich enough hackers to just take over the project and add nefarious code. I’ll never audit the code and make sure it produces the binary I get from the Apple store. So I’ve started adding my own “salt” - I type an extra character or two (same for all passwords) to the end of every password I enter. It’s the easiest way to protect against not being able to trust my local password app that I can think off.