If I understand the rule correctly you are required to keep everything as it is in the car-except you can bypass the functionality of the switches if you use an alternate panel such as you are considering. I cannot say that it is correct to totally disable the stalk switches. If the ITCS and GCR say you can....
Just my opinion

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Grandpa's toys-modded suspensions and a few other tweaks
'89 CRX Si-SCCA ITA #99
'99 Prelude=a sweet song
'03 Dodge Dakota Club Cab V8-Patriot Blue gonna tow