To address your concerns about others not recognizing your bike as di2-
1- get over it. There are about 1453 things more important to even the best among us.
- the number of cyclists who recognize if a andom specialzed bike is di2 or not are very few.
- anyone who cares will easily see your bike is di2 and not mechanical. So relax there.
- anyone who gives a damn what you ride/spend on cycling is not someone I want to be around. The fact that they care what another cyclist rides is a tough reality ton accept.