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I've gotten a few people who ask me "how much" to do this to their car as well. As I'm sure you're well aware, things are ALWAYS breaking or need adjustment.
Can you imagine if you did a swap for somebody else and the water pump died on THEM, and in turn smoked their ~$ 10K crate engine? Your name would be dragged all across the internet coals as the guy responsible for the failure. I can empathize 100% with your feeling of not wanting to do this for anyone else.
Speaking of water pumps, have you come up with any alternative solutions? I too have concerns about an electric water pump running at 100% duty cycle. Mine hasn't failed yet (knock on wood), but I figure it's only a matter of time.
I'm giving serious consideration into swapping a modern BMW electric water pump. The parts are actually engineered and tested to a standard, compared to the 3 second "It works, ship it!" validation testing performed on aftermarket components. Of course, I'd have to engineer a CAN bus gateway to set the speed, or otherwise run it in fail-safe mode... which is likely 100%.
I also played around with the idea of running a marine style sea-water pump. Of course, I would have to put this in place of the AC compressor and you just mentioned that you are trying to keep the AC. Originally, I assumed that I would want to keep the AC but there wasn't a single time last summer where I heard myself saying: "Maaan, I really wish I had that AC hooked up..."
Thanks for the updates, hopefully I'll see you on the road somewhere this summer.
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