Well, I can firm that the Geo starter DOES NOT spin the flywheel. It just does not reach.
Here's a better shot of the rubber plug in the oil dipstick hole.
So I had to switch over to the Kubota starter. Based on the orientation of the mounting holes I had to drill and tap the adapter plate, rather than bolt through it. The kubots starter is a bit smaller than the Geo's so I had to rotate the starter a bit, too.
The threaded hole at about 5 o'clock is the the new mounting hole for the Kubota geared starter.
Hey! Check this out!!! I drilled the new oil dipstick hole... finally. I used a shop vac to pull as much of the debris from the top and I plan to pull the oil pan and clean it out also while modding it for ground clearance.