There are a finite set of alternatives to interrupt a circuit. If you've discovered a new one - it's nobel prize time! If not - you've either interrupted the positive signal or the ground wire on pin 4. If the ground wire also provides stray current discharge, disconnecting it is not a great idea because of the dissimilar metals.
It's great that you drove it around for a while. Other members have done this for multiple years and reported back. And yeah- they also wired in dash switches. I guess they didn't spend $25 to have CH4x4 make custom switch covers. Maybe that's new for this particular switch.
You could probably skip the dealer trips with a techstream setup. I think almost all of us who are modifying our vehicles have a OBD code reader and most of us also have Techstream at home.
The problem is not selling a product. Plenty of people would buy a product to save the effort to do it themselves. The problem is being a freeloader and this stupid game of "I came up with something new but it's a secret." No. You didn't. And even if you did - the whole fawking point of these these threads is to share that type of information.