Sure why not. I use TagMo on my phone, it's pretty nice but not everyone has an Android device.
Bonus points if it has an Amiibo manager with icons and info, similar to some apps that exist for managing your Amiibo collection.
The best solution would be if you could make a phone's NFC reader/writer itself spoof an amiibo. No tags required.
I believe someone had already achieved that sometime in the past, but then decided not to release it so everyone probably hated them for a week or something, I dunno.
Had it on the N3ds, have tagmo on phone, Android is actually capable of emulating NFC tags, but last I looked something in android's software blocked something due to security issues.
Nfc host, emulation, whatever... is what the tap to pay apps use. NFC tools pro app has an emulate tag option, but i have not played with it enough to figure out how to make it do an amiibo.
Some time ago on a rooted device using i believe CM amiibo were spoofable? not entirely sure, been a long time.
Good luck on the idea, sounds cool, and hope you get it working.