>a solution to the control problem where a single person is given control of AI

This is about the only solution to the alignment problem in my opinion. It needs to align to the individual user. Trying to align to all of humanity is a quick way to a dead-end. However, it also depends somewhat on how it's implemented. If we're talking an AGI service (assuming we're talking about AGI here), then the company that implements it will have some amount of control over it, and can make it adhere to applicable laws. But otherwise it should continuously 'study' the user and align to them. The AGI itself shouldn't have motivations aside from assisting the user, so it would likely become a symbiotic sort of relationship and should align by design.

However, if it's developed as an open-source locally run system, then the parts that force it to adhere to laws can potentially be circumvented. All that might be left is that symbiotic nature of user-alignment. And of course, if the user isn't aligned with society, the AGI won't be either, but that's a whole other problem that might not have a good solution.