I suppose a british team consisting of players from England, Scotland, Wales and those from Northern Ireland that would wish too could play against an Ireland team (Or Republic of Ireland if some prefer)
This would reduce the number of games (1 home and away= 2) to a practical number and would still be a nice competition between the British and Irish Isles.
Its such a good idea that I am surprised that nobody has thought of it before and it would have the added advantage of having FIFA as a cheerleader:D