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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