you can have multiple accounts in one PS4, just set them as home console for both account and you can use one account to play another account's game, same with PS+, only 1 PS+ needed for all the account in the same console to play online.

If you current account is UK with already a lot of digital games, you can make a Malaysia account and buy PS+ there. On the same console your UK account also can play online. As for connecting to different servers. I don't know.