The 'Hadrians Wall Country Line Day Ranger' is £11.90 and will do you for travel all day along the Tyne Valley Line and the Cumbria Coast as far south as Ravenglass, but is not valid before 8:45. It's worth getting (well, if the 10p is worth it!) if you're going out from Newcastle on the 09:23 then, but neither later nor earlier. Otherwise I don't think there are any splitting options.