Re: How to convince a hero group that they should be registered and work for governme
I think the way to register with the government is to use a 3rd party private organization. Think of it as the American Medical Association verifying that you are a medical doctor.
In the Marvel Universe, take a trusted organization such the Avengers to be the certifying body. They could run a basic training/certification program including some professional ethics classes for any potential hero who is interested. The Avengers could easily run some telephone message center for heroes (or the government) to leave messages for each other. Give an option for voicemail box or talk to the Avenger on monitor duty.
If a hero wanted to go further and to register as "approved for government work", the hero leaves his identity and contact information with a non-networked Avenger's computer. The information file with the secret IDs is secretly placed in one or more inaccessible location. If no one unauthorized knows where the information is stored, it'll be very difficult to locate.
Examples:
1) Blue area of the moon: Inhumans and their enemies and the Watcher's enemies have no desire to learn the information.
2) Asgardian realm: Asgardians don't use computers, don't know what a flash drive is, wouldn't care if they did know, and could care less about secret identities of mortals.
3) Negative zone: They probably don't use computers and don't care about the information.
4) Titan: The people of Titan are highly ethical, have few enemies, and don't care about the information. The enemies they do have don't care about secret IDs of earthlings.
The only reason for the government to have access to secret IDs and personal contact information which hasn't been voluntarily shared by the hero is if the hero has seriously gone bonkers. If that has happened, the Avengers are probably in the best position to investigate or deal with the situation. Or to be willing to temporarily take the heat from the government for stonewalling on releasing the secret ID.
If the Avengers are incapable of dealing with it and they think the hero in question is guilty of something, an Avenger can be given the encryption key, go retrieve the information and release it to the government.
The technique could be easily adapted to less exotic locales. With some advanced technology, I could bury a flash drive 20' down in my father-in-law's neighbor's backyard without anyone knowing or ever finding it. And no one would ever think to ask me about the location since I'm a NPC rather than an Avenger.