Possibly through the accessory outlet hole on the coil cover for a K75.
Or if you perform the headlamp modification as with the other Special-K's, then the ignition switch is in the headlamp bucket.
I dont have any really good ideas for the heated grip switch except to maybe use a micro-toggle SPDT switch in a discrete place and use it to switch a relay pair that activates the heated grips (one relay = low power; other relay = high power).