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Assuming you completely block the radiator and it still does not warm up enough, consider using the pipe insulation available for home use on your heater hoses. I am talking about the flexible foam wrap that has a glue that connects it together.
If the heater core alone is enough to keep the engine cool, then you want to get as much hot coolant to the heater core as possible.
You have the means to monitor coolant temps and fan activity, and assuming you can actually get the temps above the thermostat rating by restricting heat losses, you can either use more cabin heat or reduce the radiator block area to get the temps down.
The fan operates off the temps from the area where coolant exits the radiator, so if the fan comes on you know the exit coolant temps have reached the level where you should allow more heat radiation.
It's possible that if you can get operating temps high enough the WAI may actually work better. I am basing this assumption on the possibility that the engine is running rich due to the fact that your coolant is not hot enough on any part of the graph illustrated.
regards
Mech
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