Mmmm, its not something that could be practically done by a user. There have been some discussions about changing the format, but that's happening at the client or protocol level. Someone smarter than me could probably make a "seed phrase" out of it that's easier to remember or write down, like how bitcoin seed phrases work, but it wouldn't be shorter. The length of the key is important so that it can't be physically hacked by a strong computer.
Discussion
Thank you for sharing. I learn something new about Nostr everyday and it sounds full of possibilities and freedom, something other social media platform lack.
Its definitely far from done, there is a lot of development at the protocol and client level, a lot of experimentation, things being built like civkit. I think we will end up integrating other decentralized-ish protocols too, like keet.io and matrix. The apps can use nostr as the public "handshake", and then allow users to engage in content that isn't even on the relays themselves, like a p2p video chat or private DMs; that way we are keeping the load on relays down, but for the user its all a seamless experience built into the app.