I know Mk Martin makes a front 3pt with a either clockwise or counterclockwise gear reduction kit to make the Mid-PTO reduce down to 540. They only make this for a few models unfortunately.
Even if I couldn't get front PTO setup with a 540 reduction, I could still see some uses for a front 3pt. Anybody how has ever tried to run a cultivator off a 3 point knows that this task is a P.I.T.A to try and keep the tractor straight and the cultivators out of the rows.
The 3 point looks like something like that might be easy enough to fabricate if one had a plasma cutter and good welder. As for the gear reduction PTO that might be a different story.
Those Vertrac tractors were similar to the old Toro Pro lawn tractor I used to work with. everything was front mounted and belt driven. I was always fabricating attachments out of the junk pile to make my job a little easier.