I ended up taking huge inspiration from Pass, but writing my own implementation[1] with a few more features that increased it's usefulness for my use cases.
I posted it a while ago on here[2] and Reddit[3], but it basically stores each entry as a Bash script, which gives it so much flexibility: auto-typing, references, multiple fields, executable functions, etc. I also wrote a blog post on it[4].
I'd be interested to hear what people think of if if anyone did/does end up giving it a go.
[1]: https://github.com/vimist/securestore [2]: https://news.ycombinator.com/item?id=22851447 [3]: https://www.reddit.com/r/linux/comments/g0643w/a_new_passwor... [4]: https://vimist.github.io/2020/04/12/A-New-Password-Manager.h...