How about a company that holds NSECS. So the NSEC is originated and held by the company and since it was never exposed to anyone, it is then a commodity. Basically reverse engineering a centralized key holder for a decentralized protocol. I would then have a company to call to change my forgotten password, etc, grant other people access.

It would be completely centralized of course and subject to legal stuff, but a lot of marketing maybe doesn't care about censorship.  it would be one way that an NSEC becomes a digital estate with some value.

the company would have insurance to make sure they don't expose NSECs to anyone upon pain of paying a large sum. 

 That doesn't really interest me at all, but having optionally linkable sub keys would just be good for long term security & maintenance of a single identity & it would open the door to cross platform support using the same ID. 

 that sounds like a fun challenge for someone on here.