How about using a Pressure Test Pump, such as Clarke PTP100 (from Machine Mart) for filling and topping-up suspension fluid on MGF's?
These cost £120 approx and are rated to 900psi
The pump's hose would need an adaptor to suit a low loss connector (as sold on Ebay for £30 that fit to the MGF's hydragas schrader valve).
For an outlay of £150 this new equipment may be a better buy than a secondhand "MG approved" brand pump..
Granted, this rig would not have a vacuum facility.
Thoughts?