Deleting an intercooler and its related piping can be done.
Your approach with the MoTec sounds appropriate.
If you don't mind a little more complication and it could be done, my intial thoughts would be to engage the system (start injecting) based on crossing a threshhold intake temperature of say 110* F. Then preferably meter the water flow based on duty cycle and EGT.
What this will do is always inject when you are getting high intake temps but at the same time ensure you are not bogging the motor down with too much water based on EGTs.
Could you have that matrix only be active based on a binary input from the intake temp? Do you have an EGT input?
Again my comment adds complexity which may not be needed - your initial thoughts would work very well also.
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