Best thing you can do is keep things familiar, so this is probably your best option

frostdragon

Actually apparently you can actually add a file as an attachment in KeePass.

That looks straight-forward, I'll probably stick with that unless someone has a better idea.

privacy

What's simpler than KeePass? Just need to encrypt 1 file with passwords

Signal312

Actually apparently you can actually add a file as an attachment in KeePass.  

[https://keepass.info/help/base/faq_tech.html#rtftext](https://keepass.info/help/base/faq_tech.html#rtftext)

That looks straight-forward, I'll probably stick with that unless someone has a better idea. 