I have thought a lot about using the escort I/C as i would be so easy, not having to weld in alu and all that stuff

I would run it using an external water pump. i have a small honda 400cc bike radiator with a big fan on.

I would use the water injection dialog on the SECS monitor to trigger a timing rely, the secs should trigger the timing rely when it gets positiv boost And the timing rely should stay "On" for 5-10 min, kicking on the fan on the bike radiator. I think the matrix pump should be "on" using the ignition power....so all the time the engine runs, the water is circulating.
I have all the wiring done from an other fun project that did not work at all (Home build charge cooler weldede together from sheet metal steel plate, forming an upside down U profil. A tight fit over the original 2wd I/C )