I think you will be fine as there have always been mobility challenged people on each of my ACL cruises. The crew is always ready to assist those needing help boarding and disembarking.
Mike😊
I can recommend without reservation The Bagatelle. Just a few steps up Duval and I have not had a bad meal there in over 30 years.
https://www.bagatellekeywest.com
Check out the menu to see if it meets your needs.
Mike😊