No support for NFC tokens You don't do anything that OpenKeychain doesn't  and fail to do some of what it does. Back-porting features from OpenKeychain  you missed the most important one - it's ability to use keys on NFC-accessible hardware tokens such as Yubikey NEO. I think this omission is far more important than your ability to accept public keys from another phone via NFC. Uninstalling.
March 05 2016