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@jersey
that's the worst solution because by connecting the rear stays with two bolts, you transform the rear "triangle" into a rear "trapazoid" and you then lose the inherent strength of a triangle. When MTBs normally do this, they aren't disrupting the integrity of the rear triangle, because the seat stay and the chain stay are still directly connected.
the couplers are the most elegant soloution i've seen
ANT bikes here in the states has the simplest solution i've seen, however. There is only one bolt which disrupts the triangle, and therefore remains a triangle. Look closely. This particular photo doesn't show it with a belt drive, but the bike is designed to accept them.
For those interested, ANT makes some of the simplest most utilitarian classy steeds around.