It would be good to have the ability to securely synchronize the clipboard between devices. Sometimes we need to copy an email, password, TOTP crypto wallet address, ... on one app and paste it in another. The copy/paste can sometimes be cross devices. There are currently very limited options for end-to-end encrypted clipboard synchronization services.
The tool could also keep an encrypted history of all data, instead of relying on the OS.
Such tool could be a standalone app, or it could be integrated into the native apps of Proton Drive or Pass (when it gets a native app).