An update. A&K later responded that they actually can replace the cable - and they sent me a new one. That fixed the problem, but the new cable is thicker and heavier than the original, which tends to pull the IEMs out of my ears easily. Also they have more microphonics.
Any chance you can take a closeup picture of the A&K replacement cable? I own the AKR02 as well, and I’d like to see what they’re replacing the stock cable with.