The mirrors are small, but much closer to the rider than stock. Plus, if you are lane splitting , something has to give. I'm not sure it's really possible to have a large mirror set, and a narrow bike.
As a veteran lane splitter (uh, twice, for about 75 feet) our stock mirrors are about the perfect size, height and shape to snag a Ford f 350's mirrors. It's really bad if there are two trucks, side by side.
By the way, we have this amazing technology pool to draw from. Electronics can control wheelies.....serious, as if a rider can't quite figure out how to make the front wheel go back to the ground?....we get this, and no video camera to see what's behind us? I wonder if that might be an answer? Some sort of small camera for real use, and small mirrors to satisfy the legal requirement?