How to have isolated FIDO access in Android 7.x? I know the generic thread  How do I use my Google account when I have a FIDO U2F Key attached? 
I would like to limit the access to two modes, such that creating an isolated access if you do not have the FIDO key connected to your phone


without YubiKey 4c connected, only basic phone capabilities like in Nokia phones
with YubiKe 4c Connected, all features allowed


I know that there are some custom applications which try to accomplish similar goals etc here. 
However, I think the case requires an OS development approach to succeed. 
I think the security team and OS development team should target the security tweak in current Android systems where they do not offer by default Android with keys. 

Phone: any Android 7.x phone
Android: 7
Not supported by default. No maintainer for the feature in Android 7.