I think I can construct something like that. Will give it a try. My carbs do look different to yours. But I think it's more to do with your emmision control laws. My basic carbs matches yours. Without those extra pipes...
I'd like to see some more pics of those carbs, from the top down, and from the bottom.. also both sides of the rack, and from the rear...
from what I am seeing in your photos, they are not ZG/GTR carbs, there are no aircut diaphragms located (on #1 & #3)
Early Ninja models did not have aircut valves either, and came in permutations of 32mm, 34mm, and 36mm sizes (that is the actual diameter of the exit port, or Outlet, on the front of the carb)
what does the bore measure on yours?
the Concours had 32mm CVK32 thruout the length of production.
also, all of your float bowls have the drain screws pointing in the same direction... odd, because iirc on all installations, the screw drain points to the outboard side by half, left 2 point left, right 2 point right...