Wow. I just bought a couple of new YubiKeys for the OpenPGP Curve25519 support. I was looking forward to using the NFC feature with my Android phone. Is it just a Chrome problem? I downloaded some OpenPGP app from fdroid and it says it supports NFC keys.
I'm not sure about your exact situation, lot of the scenarios are OK, just the one without Google services which are dependent on Google account doesn't work. That is actually irrelevant for "normal" phone users that are logged to Google all the time anyway.
