I believe I am right in saying that a northern taxiway would need to join Rwy20 from the east (there is not enough space the other/terminal side, as things currently stand), so it would still involve a runway crossing (maybe at the current northerly entry point?), then parallel taxiway on the eastern side.
This would fit with establishing parking stands to the NE of the runway, which I believe was part of past Masterplans?