Well, the later Ju-88 series became known for those marsupial-pouch belly panniers. How about going the whole hog (or, perhaps, wombat) ...
Could see that doing Grand Canyon tours as well.....
Perhaps it could be converted to nosewheel configuration? Extend the engine pods aft of the wing to provide a new, aft mounting point for the long, retractable gear, then put the nosewheel in the base of the pod, either fixed (and spatted, of course
) or retractable. You could use a similar configuration for cargo with a "tin" pod with a rear door.
Like GTX's Tri-motor too.