I guess people coming over from the Wirral and Cheshire by train will have their own new match day pubs. There are pubs galore near James Street and a shuttle buses outside the station would be very well used.
I suppose you could argue that it makes no sense to spend a few minutes changing to the Northern line at James Street, to wait a few more minutes, to catch a train which will actually take you past BMD for you to get off at Sandhills and walk the 12 minutes back to BMD (yes, I've timed that one as well). Timewise, that wouldn't be much of a saving on walking it (not withstanding bad weather). A shuttle bus from James Street for Wirral and Cheshire Toffees is an obvious solution. IMHO, of course.