fenden

Sure you can. When the QR code is presented program it into multiple authenticators.

I saved the setup QR code into an encrypted note in lastpass. So Ican setup a new authentication device if/as needed. This would generally be less secure except that I have Lastpass geographically restricted and second factor secured with a Yubikey.

Good! And it's not difficult to setup QR code.

You can integrate the barcode scanner library to evernote with some code.

The one I share has free trial, you can test it for 30 days, if you use it not for business, I think it can help you.