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If you find a 70's Dodge (800 series, I think) military de-icer truck, they used a 4 cyl gasoline(same as the mep-003) engine and belt drive to a hydraulic pump(about the same size as a wrecker).
A friend of mine has one.
If it was for a one time use(changing your engine), you could improvise and use something like your tractor(with loader) or a wood-splitter or whatever you can source, and plumb it into the hydraulics.
Just don't over pressurize the system.