One of the goals of "fractionating" (ie: CK, FSR, Novalis, Trilogy) is hearing preservation.
If you read the CK site, you will see that CK is used for many different ailments, many of them malignant growths (ie: prostate cancer, now used for breast cancer, etc). So, they will note their use for cancer treatments but if you look at it carefully, you will also see it being used for benign issues such as AVM's, meningiomas and yes, AN's.
Experience is key. Many AN'ers here on these forums have had CK done as well as FSR, Trilogy, etc. Leave no stone unturned in doing your homework as you want to be able to make the best, well-informed decision you can for you and your particular/unique AN journey.
Please remember that all treatment options (surgical and radio) come with risks (as with any medical treatment option for any ailment) and "individual results may vary....." Homework is key and it looks like you are doing all the right things to help achieve your goal. Hang in there!
Phyl