I am sure this is hidden away somewhere on the new 'improved' offical site, but can you just pay on the gate for the above?
I had the problem a couple of years back at Blackpool that the club wouldn't sell me tickets prior to the game as I have a Lancaster postcode, but if I can just pay on gate it will be fine for what is essentially my home game of the year.
Don't see why not, it's unreserved seating in a big stand.