@nla4625 @grump If you might be looking for another opinion, there is a surgeon who grafts a nerve to replace the phrenic nerve. I saw another patient mention this so I'm passing along the information as I have no experience with this issue. Here are some links.
https://www.advancedreconstruction.com/phrenic-nerve-program/
https://www.uclahealth.org/Workfiles/clinical_updates/plastic-surgery/14v2-11PhrenicNerve.pdf
https://www.masserypt.com/wp-content/uploads/2018/05/Massery.-Phrenic-Nerve-PT.-Rehab-Surgery-Chap-11.-2017.pdf