I think I'm just going to buy the adjustable fan switch from flex-a-lite, although the mod seems like a cheap way to get the same effect.
I guess big projects start small. Initially I changed the the thermostat to replace a potentially bad one, so I went with a low-temp one (170f), now I'm considering getting an adjustable fan switch for my radiator fans to keep it even colder. I might have longer warm-ups, but I'm sure the extra cooling under the hood should help things out quite a bit.
Now I'm even considering getting a faster, lower-draw radiator fan, I've heard you can gain some power from them.