It sounds like this surgeon has good judgement. Removing the PEEK non-fused cages along with the non-fused instrumentation and replacing them with allograft and autograft is reasonable thinking. While he is there, realigning the neck back to a more normal alignment would also be a good move. You might have found a good reconstruction surgeon.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.