I think an app that acts as keyboard and scans + types NFC tag IDs, like the KBR1, would be nice to have. A KBRApp.
There are multiple options to connect a HID, bluetooth and USB.
I think a bluetooth version would even be possible without rooting the device! (Cuz there are apps to act as keyboard.)
No, I don’t wanna develop it, but I’d pay $4,99 on the Play Store.