this doesn't have to be financed directly from the Steemit Inc Steem stake/wallet

Correct, it could come from SPS or some other on-chain governance system.

There is no other practical way for the Steem community to hold someone to their obligations, even if it were someone who, unlike Justin, had any reputation for or track record of honest and reliable dealings.

verifiable, legal and eventually will be honoured.

We have that, using on-chain governance. I would invite Justin to embrace it instead of working to undermine it.

BTW, a blockchain can not sign a contract. There are good reasons why blockchains create their own governance and enforcement mechanisms.

Justin came to us (us meaning the blockchain, not Steemit Inc) uninvited. It is up to him to respect and embrace the values and institutions of the community that he is seeking to join. As long as he refuses to do so and, instead, acts like he bought a blockchain or community (which he can not and did not) and makes demands, while working to undermine those values and institutions through manipulation, cheating, trickery, and deceit, the community will continue to reject him.