

Let’s see how many governments will end up with a D rating. The USA are probably a given but this might set a lot of major companies on fire so who knows who else will run out of money.
Of course China is laughing all the way to the bank. Their economy isn’t super healthy right now but they aren’t reliant on semiconductor companies that chained themselves to the AI racket. So they might weather the crash mostly unharmed and we’ll all end up buying Loongson in the future because all of the x64 and ARM companies have folded.











I think what you’re thinking of is a limited free trade agreement. The UK is free to pursue one of those. The UK would probably have to play by EU rules regarding things like product standards (with little say in what those rules are) but free trade without freedom of movement is absolutely doable.
A military alliance is also no problem.
Anything beyond that is going to be difficult, though. For countries joining the EU after it’s inception, points 2 and 3 are hard requirements. The UK doesn’t have much to offer that would justify giving it special treatment.