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Thank you Chris for inviting me to the conversation. @tin, the question to ask yourself now is how much can you move now with the spine flexibility that you currently have? If you have collapsed discs that are still in your spine because of an earlier less invasive procedure, have you already lost flexibility of those discs? Are you having problems with stability now that needs hardware fixation? What has changed in your symptoms for you to seek out and consider constructs with rods and screws? Has your surgeon done any X-rays that show instability of discs with different spine positions, and have they compared a standing full body X-ray with X-rays taken while seated or laying down? Do you have compression of nerves or the spinal cord now? One thing to consider asking is if a new surgery would make you worse and increase your pain. I think that is what the other surgeons were indicating with their responses. Most surgeons do not promise to cure pain, and instead they preserve function or keep something from getting worse and causing more dysfunction. You might also ask yourself why this other surgeon is willing to do a procedure that the others think is a bad idea. What promises is the doctor making to you? You might want to look for any complaints against the surgeon. Call your insurance company and ask about the surgeons ratings and success statistics.

Here is something else to consider. When discs collapse, over time the spine can fuse itself when bony growth happens in response to pressure. It would be worth asking for a detailed explanation on an MRI about the current condition of your spine and the discs in question. Only a spine surgeon can tell you what they think your outcome would be, and remember, people are all different with different capabilities and health/disease status, so you may not get a precise answer. I thought about this too when I was having C5 & C6 fused and wondered if I would be able to fully turn my head. The answer is yes, because most of head turning is done by C1 & C2 with just a little bit of help from C3 and C4, so C5/C6 has very little to add. I cannot touch my chin to my chest anymore post surgery, but it is within one finger close. Fusing and adding rods to any level of the spine will freeze any movement, and you have to ask how loosing that movement will affect your function. It may be a lot or it may be a little.

Would you be willing to work with a physical therapist to try to treat and improve the scar tissue before you jump into another surgery? Every surgery will create more scar tissue, and scar tissue in the fascial layers can cause tightness, restricted movement and pain. Fascia can be treated with myofascial release procedures by a specially trained physical therapist. This is something that I do with my physical therapist and I do have a cervical spine surgery scar that I also stretch periodically with facial release.

Here is our discussion on myofascial release with lots of links and detailed information in the first pages. Give yourself some time to read and understand MFR if you have never tried it. Your doctor may not be familiar with it, and they train on dead things when they learn dissection, so they may not think about the role of the living fascia.
https://connect.mayoclinic.org/discussion/myofascial-release-therapy-mfr-for-treating-compression-and-pain/
Does this sound like something that can benefit you?