Flipping the diff means that the "wrong" rotation is still going through the transmission and drive shaft (or whatever drive mechanism). Running a transmission "backwards" is not a good idea, unless you've got one that is designed to survive spinning both ways. (I think one that uses all straight-cut gears would be OK, as long as there weren't any oiling concerns.) The helical gears in the transmission will be pushing on stuff they're not designed to push on, leading to accelerated wear pretty quickly.
You'd be OK if there were a RWD Honda that hooked up to a D-series engine; you could use the transmission from it. But I don't know of any such animal.
I would doubt that anyone makes reverse-rotation cams for the Honda engines, either.
One possibility might be to use the whole drivetrain (engine, trans, axles, etc.) and move it to the middle or rear of the car. But that only works if you have significant flexibility about packaging things. If your layout is already set for front engine, that's a no-go.
-soD
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