Nether portal block correspondence

So I'm trying to make a large (6x7) nether portal that is the same size in both dimensions. I would like to make each portal block link to the corresponding block because of some of the peculiarities of my design. (Long story short, it's a divided hallway.)

Here's the layout I have now: (O: Obsidian, P: Portal block)

OOOOOOOOO
OPPPPPPPO
OPPPPPPPO
OPPPPPPPO
OPPPPPPPO
OPPPPPPPO
OPPPPPPPO
OPPPPPPPO
OOOOOOOOO

Currently, no matter which portal block I enter from, I appear at the same one each time. Is there a way to change this behavior?

Solution 1:

Since the Overworld coordinates correspond to Nether coordinates in 8:1 proportions, there's no way to achieve what you want - an 8x8 square in the Overworld corresponds to a single block in the Nether.