I always mount and dismount left foot forward. (doing the swing-the-right-leg-over-the-saddle thing) I badly injured my left knee in the mid-90s. (lesson: never let anyone talk you into a trail ride when you're not even in the mood to leave the house) Fell on a steep climb, after hitting a wet root, on my cross bike and twisted the knee so far it was like, "Wow! I didn't know it could bend that way!" After months of physio I finally had to go for arthroscopy. Even after all that, I still can't teach myself to reverse my habits and lead with my right foot. Every time I try I just fall or wipe out spectacularly. Maybe, eventually a brain injury will result and correct everything. In the meantime, I've had to swear off clipless pedals and go back to toeclips. I still suffer knee pain as a result, (I'm currently doing food delivery for a living) and I'm sure that reversing to the other foot is the clear answer but, I still can't teach myself to do it. I sincerely wish the OP good luck in trying to reverse feet. I wish I could.