I think a larger wheel would sort of change the “gear” ratio a bit. Kind of like a larger truck tire/wheel would roll further in one revolution than a smaller diameter one 
Or like putting a small diameter steering wheel in a big rig, you would be turning and turning the wheel and not really getting anywhere. Am I making any sense
No. That's not how it works. In fact, it's sort of the opposite. A larger wheel might slightly reduce the force required to turn the wheel a given diatance (ie, inches around the circumference), but the added distance required to move the wheel would add up to the same amount of effort (a larger diameter wheel has a greater circumference).
Anyway, your chief gripe, as I recall, was the number of turns required to go from lock to lock, which would remain exactly the same (though you would be moving your arm over a larger arc, so I think it would actually exacerbate the problem).
If you want to reduce the turns required, the solution as I posted above, is to go with a larger displacement helm (the pump upon which the steering wheel is mounted). However, you should be aware that this will result in a corresponding increase in the effort required to turn the wheel. The solution to this is to a) install a larger diameter wheel, b) upgrade from the small diameter, restrictive Baystar plastic tubing to larger, more robust SeaStar made-to-length hoses, which allow the fluid to flow more easily, or c) incorporate more upper body exercises into your workout routine.
