Only thing brits get pissed off about is calling the UK England, because all the countries hate England including probably the English.

I don't see how it's nonsensical. Makes perfect sense to me. Call the country what people know the country as. You want to call the United Kingdom, Kingdom United do it. You will obviously get raised eyebrows because you will only be the one calling it that.

I don't really know what more I can say.