This idea could be taken further to get past the past the ugliness complaint. Imagine something takes Markdown from these and renders it only if verified. Someone could stand up a TLS-protected site (possibly protected with a letsencrypt.com cert to reduce cost) that conditionally renders (based on keybase verify) and potentially caches renders for performance.
Either way, this is neat and I'm excited to see what other ideas our creative crowd come up with in using Keybase.io's new file system feature.