Good on you for the offer, 4th point. I'm interested in results myself. My torque wrench of choice came with a certificate of calibration. Could it be wrong? Yes. In fairness though, I have no more reason to believe in your ability to check these instruments than Wanda or Pham.
You're making it way too complicated. If you can tighten a nut with a wrench and read a display, you could do it. That is, to read the actual torque value vs the torque wrench.
I don't plan to re-cal anyone's wrench for them though.
