Regardless of whether you think it is a problem, based on the average of the polls running on three forums, it is clear fifty or a greater percentage of people carrying appendix, also carry in another position. Debate isn't going to materially change that practice, because police officers who also carry appendix when concealed, aren't going to stop doing that or using duty holsters. Folks who carry appendix and shoot IDPA and USPSA Production, aren't going to give up competing. YVK will continue to use a fanny pack when he doesn't have a belt, and Jody will lounge around with his J frame, go out on date night with his pocket Kahr, and ride his dirt bike with an ALS.
So what do you do about this. I would suggest you first run a series of tests to determine what the time penalty is for going to the wrong holster. Surely, if you reach for your drop rig and then realize your pistol is appendix, do you give up or continue? Of course, it is no different than whether you get a bad grip, or a fouled shirt on a regular appendix draw -- you fix it and continue.
Start with measuring the delta in time, but then start making drills that force you to learn to quickly move your hand in response to a mistake. Or do what I do, and start the draw with a hand position common to appendix and hip carry. Train to the positions you carry, and spend your time worrying about more important things, like should you carry G2 or 124+P Gold Dot, or use the slide stop on a reload.