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I had an Air Force Air compressor MC-2A that used a HATZ air cooled engine to power a rotary air compressor. The motor is small in size so it would be good fit. Here ia a picture of the motor inside the compressor trailer:
Here is another possible source. If you can get the power unit from a all-terrain scissors lift or boom lift it should be able to handle your hydraulic needs. The engine is small footprint and some are gasoline/LP combo units.