(Another user) I've been trying to switch from Keeweb, and Vaultwarden is extremely keyboard-unfriendly in comparison. Perhaps the normal user only use it for auto-completing web forms using a browser extension, but I feel it's actively painful to use the web interface.

Have you tried the desktop application? (I haven't, but there is one, which is assumedly better)

If not, Bitwarden clients are open source, might be worth raising a feature request or offering someone a few bucks to implement what you want to see if you can't DIY.

With my particular use case, I don't auto-fill as that's a security vuln waiting to happen.

Curious why you're looking to switch from KeeWeb. Been using KeeWeb for several years and have been really happy with it for my desktop.

I'm looking for something with integrated storage that enables emergency delegation and securely sharing of passwords within the family.

Isn't that another electron "app"?