Take my advice for it:

Buy a diver bottle and a fillerkit.

They are not that more expensive then a handpump, they operate faster, they give much better air and they are not expensive to run.

Dont forget that some PCP cant handle the moisture from stirrup pumps and to fill a large gun is indeed very hard work..

I used to have a FX Mk II stirrup pump but now I use a 8 liter 300 bar bottle instead, its like comming to heaven..