How are you intending to vary ground speed? With a hydraulic flow control valve?
If a unit capable of 18 to 20 HP would work, and you are mechanically-inclined, you could take the hydrostatic unit from an older GARDEN tractor and modify it to connect to the drivetrain you have.
Example would be ebay auction #262369909629.
That is a self-contained hydro unit, charge pump, hydro pump and motor are all in one unit.
Has input shaft with pass through PTO output shaft, and bevel gear speed-controlled output. Even has a spin-on filter mounting provision.
Input is 3600 RPM, output is 0 - 3600 RPM, and they are capable of 20+ HP.
You would need to remove the output bevel gear and have a custom hub made up for whatever exactly you will be driving with it, and provide some type of oil seal and retainer at that area.
If you can figure out an output hub and seal, it's pretty reasonable at $175.00.
If you feel that isn't large enough after your repower, you could try to find a similar system from a wrecked skid-steer, or, if in ag country, a windrower.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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