It will work. Randen tried doing this in his workshop and it did a good job of making cool, damp air. The supply air temperature will fall to the point where the water starts to condense. The heat pump coil will then lay waste to the air stream, both latent and sensible. The performance indicator is the EFFECTIVENESS of your pre-cooler. Any extra effectiveness of your water-side heat exchangers is good for the air side. Yes, raising your entering water temp to the condenser will shift your balance point slightly, but not enough to matter. You are basically relieving the compressor and evaporator of whatever heat load the tempering exchanger transfers.
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