I have degenerative disc disease - cervical and lumbar and moving into thoracic and the 's' region - and spondylosis with myelopathy also in those areas. The degenerative aspect is causing the spondylosis to spread up and down my spine and will eventually, in the not to distant future, meet in the middle. I had the same neurologist and neurosurgeon throughout this onslaught of herniating discs; have had three neck surgeries - soon to be a fourth and final in which they will implant two rods in the back of my neck, from C2 - T1 - and am in desperate need of a second back surgery. OK, so having said all of that, I feel that I am almost somewhat of an expert in this area (LOl)...I strongly advise against wearing a cervical collar unless it is to sleep in, as it will make your neck weak(er) and the position in which you must sit to ride a bike can cause great aggravation to any involvement of your neck...think of the pressure you are putting on it when you're leaning forward but using your arms and neck to keep you from "laying on" the handlebars, right?! Also, I'm sure you are aware that we have nerves that run the length of our body and can very much have effects from cervical issues to neuro issues in the feet...the Dr who told you it was "impossible" is wrong and not a reliable source of information!
I just got my MRI results that show spondylosis C2-C7 and also narrowing of the spinal canal. I was having severe pain. Prescribed Nsaid and an additional pain medication by my neurologist. I have read that wearing a cervical collar during the day, for several hours, can also help.