I have no experience with the Mikunis.. but...
that front carb float cover on the SUs is basically just a T fitting... not two inlets. One in, one out to the second carb. I'd think a T fitting should be fine.
Carburettors run off the floats, so as long as enough fuel gets to the floats, it should be fine. I expect the mechanical pump should do.
Keep in mind.. you'll get 20mpg... so as long as your fuel pump can deliver a gallon of gas every 20 miles, it's all you need.
I'm running a stock mechanical pump with my Weber DCOE's, and haven't run out of gas yet (even with no gauge and getting about 8mpg :-) )
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-Matt I ♥ my ♂
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