Does he have a telescope, OP? And (apologies if you've done all this already) but do any of you engage with him in his interest? I realise this may mean being bored rigid by the subject, but....
I ask, because if the obsession is space and rockets etc, set him onto Space X, the ISS and Starlink and go watch for them. They're visible at various times from the UK - it would get him outside, if that's a goal. There are many stargazing apps that can be downloaded, as well.
Did you watch the Dragon launch with him in July? If not, the first full crew are flying around the 23rd Oct, and NASA will very probably do a full 'live' broadcast, including background comms chatter and some pretty involved science stuff. Offer to watch it as a family, prime yourselves to ask him questions.
Get him and your DD looking at Generation Artemis stuff through NASA, as well, if you want them to interact. End goal is a new moon landing in 2024, with a 1st female astronaut on the moon, and they're targeting engagement from teens and pre-teens.
Audible has various books on astrophysics, including a couple prefaced by Neil DeGrasse Tyson and read by LeVar Burton - a good compromise might be that he can't YouTube/Social Media after certain points, but he but he can listen to audio books on the subjects.
Get him doing online stretch classes in physics, match, engineering etc. Introduce him to TED talks. If he has to have an obsession, this really isn't a bad one to have. If nothing else, it encourages schooling and learning.
It's worth being aware that there is an active online community in these fields that he might very well be engaging with - this may be his 'social life'. There's a fair bit of information only posted through these groups, so he might be using them to 'keep up' and talk to people with the same interests.
His behaviour isn't okay - it's not okay for him to be hitting and threatening you, and that needs to be stopped however it needs to be stopped, including police involvement if needed - but it might be worth splitting what could be a positive interest/obsession out from the general 'phone/attitude' negative thing. It may be that he doesn't have the skillset to explain the difference between 'phone' and 'link to my social life/interests' so can only react negatively.
If nothing else, physics/rockets/NASA/astronauts - those are things full of rules and requirements for behaviour. Coming at his behaviour from the side of the obsession might be a way in to talking about it, without him realising you are and reacting. Ask him how he thinks he would need to be able to act to join a rocket building team, or even crew the ISS? Could he shout and scream and hit people? Or would that be dangerous? Ask him why it would be dangerous. Ask him what would happen if the crew ignored the rules, and their work, for just doing what they wanted? Has he ever looked at Astronaut selection criteria - attitude is a huge factor. Have him 'practice' the rules, and the needed attitude. I don't know if he has the theory of mind for this to work - and, again, if you've already tried it, I'm sorry - but I just thought I'd throw it out there in case.