the same thought has occurred to Cyprus and Spain, both of which have minorities that would like to be independent (and of course Britain has had recent rouble with the Northern Irish, some of whom wanted the same thing). So they are not welcoming Kosovo's independence. But there have been bitter wars over Kosovo in the last 20 years and the Serbs and Kosovans (who are basically Albanians) hate each other, which is hardly the situation in Birmingham (I hope).
Whether Kosovo can be economically viable as an independent state is another matter. But same point: could the Independent Birmingham Republic actually produce enough wealth on its own to pay its way in the world? I suspect not.