Didn't get an answer on this. I thought a bit more about how it would have to work - here's my ideal way to improve logins on #Nostr 

You'd have 3 types of keypairs you can register on nostr:
• Primary profile keypair
• Redirect keypair 
• Signature keypair

Your primary profile keypair is like the keypair I'm posting this post with. It's for everyday use.

A redirect keypair can point from a signature keypair or another redirect keypair, to a primary profile keypair or another redirect keypair. It can't do shit else. You keep it buried in the woods in case your everyday use primary profile key is compromised.

The signature keypair should only be used once, to set a redirect keypair, then burned. All it does is point to a redirect keypair.

You put your signature keypair on your business cards or your hat or whatever, then a nostr client looks at the redirect key and finds your current profile from there.
Every time you're looking at a post from a given user, your nostr client can check the redirect chain to verify what signature keys do and don't link up.

So, is this already a NIP or is there a better version of anything? It's possible this concept has already been discussed, I'm not sure

nostr:nevent1qqs2dpa4rnuye4k84rgd0qjv6hd5dptygt6kmfkedn5e9uu2a0n7despz4mhxue69uhhyetvv9ujumt0wd68ytnsw43qygxvg8sqzdvs7wgr36rawtgyswymqgn5r7ve4ctejrpjgl9f5nms3vpsgqqqqqqsufjzgj