I believe this is an easy fix for your audiologist.
As far as you losing your residual hearing there might still be a chance of getting some of it back as your ear heals and swelling goes down. Small chance probably. I have read this before, no experience with this at all. The other thought is everyone I have read about that did keep some residual hearing lost it in time.
I was told by my surgeon to expect 30% loss of my residual hearing that I did have going into the surgery. That did not leave much from so little hearing I had. I expected to be dead after the surgery.
Being bilateral I am deaf when the processors are off except for the crazy tinnitus. Thankfully that goes away when the processors are on. Being totally deaf was an eye opener at first but quickly subsided. Thankfully I have a helpful wife who understands all this.