I am one who has unequal leg lengths, 1/2". (And didn't know it for my first 60 years, Just thought I was generally asymmetrical.) I now use a 1/2" shim in my right shoes and a 1/4" shim for those cleats. I also pivot my seat nose a little to the left. And I set my cleats up differently; nearly straight for my left foot and forcing real toe-in for the right foot. (I use no-float cleats. For SPDs I have to set the right shoe up with all the toe-in physically possible. Next go-round, I might even file the cleats to get more.)

Not saying that the OP should do any of this. Just keep an open mind. If I insisted on doing what most do, I would have had the knee-replacement surgery 30 years age. Instead, both knees are doing well.

Edit: I probably have normal arch in my right foot and a very flat left foot as a compensating factor for my unequal leg lengths, hiding that unequal length to some extent and meaning that my shoes wear in quite differently.

Ben