I loved doing my masters (I bypassed the first degree) in Digital Media and Society, and I'm sure you would enjoy studying at that level, too. I was working at the other university in Leicester at the time co-ordinating a project that was teaching people about wealth creation through social media - it was just before the advent of the blockchain, I'm sure we would have been all over that.
Most libraries offer external reader's membership, it usually costs bout £30 a year, although if you are studying at another university, you can get free access through SCONAL (I think that's the scheme anyway). For that, I can borrow 10 books at a time. I never would because, well, carrying them! But I get to study in the library, there's a lovely cafe there, I bump into people I know, and they often have open events and lectures about interesting things.
You don't get access to the electronic resources, but I've found that with skillful searching on google, you can often access academic articles. From here, it's a very nice walk through a little shopping area and then across the park, or an easy bus ride. There's also a couple of nice pubs nearby, and I belong to the Gas Club round the corner, so I sometimes stop off for a drink and a natter on the way home.
What might you study for your masters?
RE: Are the sociocultural and the cross-cultural approaches incompatible?