Your combine would have a closed-circuit hydrostatic pump for the propel system but the way a hydro drive works you cannot run multiple independent systems (like the propel and also an implement drive) off of the same pump. Self-propelled windrowers actually have at least three individual hydrostatic pump/motor systems - one for each wheel motor and at least one, if not two, for the header drive.
Regardless, if you're wanting to run a disc mower/conditioner with a hydrostat you'd want to have around 7 hydraulic horsepower per foot of cut to have satisfactory performance. (This is more of a minimum - actual SP windrowers can deliver closer to 12 hp/ft.) This would equate to around 50 gallons per minute at 4000 psi for a 16-ft header. In other words, running a rotary header takes big flow and big pressure which in turn requires a well-engineered system to function properly and keep cool. Years ago the Hesston windrower ran the rotary header with a big load-sensing open-circuit pump which would be another option for you but the statement above still holds true.
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