"They want magic."
I've been using this system every single day for months now. It's functional and non-magical. And it doesn't disrupt the regular Nostr protocol. The post I am making right now is fully compatible with both regular Nostr clients and with Inkan.
Inkan uses exactly the same kind-0 profile for the pubkey that signed this post as all other Nostr clients do.
Inkan merely recognizes that the signing key is making the post on behalf of a master identity, and attributes the post to that master identity.