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Is that a module switch or just the display component? Is that not quite expensive to do? I would tend to agree with @rj, the GW-5000 might be what you want and even though it's a JDM model that you'd have to import it could work out not much more expensive. (Also, it's a slightly more deluxe model that has a screw down caseback like the original G-shocks did, which is why it's more expensive in the first place.)
Yeah, the negative displays on these look cool but they are pretty poor for legibility. Even in bright daylight they're much harder to read than the standard LCDs. The big draw of the 5610 is that they're kind of the ultimate practical watch - solar, radio sync, world time, chrono, water and shock resistant etc - so failing on the legibility front sits a bit odd with it.