I had an idea to enhance the security of nostr signer apps like Amber nostr:npub1w4uswmv6lu9yel005l3qgheysmr7tk9uvwluddznju3nuxalevvs2d0jr5. A fully offline and super lightweight event signer companion app called Amber Secret Keeper. It only has permission to talk to Amber, which would handle all interaction with other apps and the user. It would rarely need updates and have a much smaller codebase.