Maybe some program that wipes the computer's drive after a period of inactivity? Some other tools or some tips I didn't consider?
I've been toying with the idea of writing a dead man's switch in the form of a telegram bot that monitors my profile for automatic account deletion, if thats even possible. I'd have it send my partner an email with everything she needs to get into bitwarden and to cash out hidden assets. Having it trigger a mass deletion instead would fit your use case.