VisaScheme might have some value to a UK entity. It is a common wording over here for the various Government initiatives, each one being called 'this/that Visa Scheme" Using Google set to the UK search will give you some idea how common the word pairing is in the UK. It's going to depend on traffic if you want to spark the interest of an Immigration lawyer. In this instance I don't think the traffic needs to be extremely high.
I would set-up parking with 'UK Lawyers/ UK immigration Services' etc as Key words and test the ground. (avoid anything to do with Financial services) The rest have no value imo.
The domain looks terrible in all lower case reads as visas cheme. As for targeting brandables , your way off the mark