I am not sure if that will fit a Howhit at all. Looks noting like the external unit that BD sells and appears to bolt directly to the gear housing somehow. Certainly would put the sprocket out too far to come close to lining up with the axle sprocket and would require a shifter as you mentioned. Looks like a lot of work to save minimal dollars over the essentially bolt-on unit from BD.
The BD unit is very different, it mounts to the output shaft and than has a bar that attaches to the engine case so the reverse assembly doesn't spin. It is cable actuated and is a very simple system. I put a very similar external unit on our spiderbox, I got it from a Carter Talon I purchased for parts.
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