I'm not into "cobbing" by any means, but to keep the cars authenticity for originality ( and to save GOBS of time and aggravation) You could NICELY intermediate the power wire to the blower motor, and instal easily a toggle switch under the dash , nicely hidden. To me this would be less of a COB then installing something the car never came with from the factory, and it CAN BE removed/ reversed quickly if you don't want this switch any longer , (JMO)