Sounds like a thread for @Escape. He had, and again has on the new build, a serpentine-belt driven pump in place of the aircon compressor. From my understanding, there's only so much power you can put through a seperpentine belt, and that's pretty much a tradeoff of speed vs pulling power. So by sacrificing speed you can retain the pulling power.
The setup in Mouse was nice, but has the downside of a lot of custom components I think. The rad on the 109 is still in front, right? Then you suddenly have a pump fighting for space with a rad, doesn't sound ideal.
The winch in Mouse had a two-speed motor, which was excellent for spooling up rope. Nearly made me sprint if you put the revs up a bit
Do you really need a super-fast winch though? You're not doing winch challenges, and a few minutes of extra time spooling up rope vs a few grand extra for a fancy pump, I know which I'd choose It'll pull you through the bog or up a hill all day long anyway, might just take a little bit longer.