Migraine aura wihtout pain is sometimes also referrred to as “Silent Migraine”.
It should be noted that for this to be considered an aura the symptoms should be “fully reversible”. If there are constant signs which don't improve and deteriorate over time I would suggest structures other than the neck are most likely at play and your line of investigation is appropriate.
As with other migraine types the research is pointing more and more towards the underlying problem being a sensitivity or “over activity” of nerve cells within the brainstem. On reaching a particular threshold they can trigger what is being called “Cortical Spreading Depression”. This is a wave of decreasing activity that can spread across the brain which often renders migraineurs unable to function, even as in your case, in the absence of pain.
The centre in the brainstem that is overactive receives direct input from the upper cervical nerve roots, and as such they are capable of providing this “over activity” and hence, yes, neck movement with a dysfunctional neck could trigger your attacks.
It is good that you have had this investigated by your doctors and specialists, but I would also reccomend having your neck assessed using highly specific techniques that allow us to rule in or out the contribution of your neck to the problem.
In short, if we can temporarily reproduce some or all of your symptoms, and have them ease whilst sustaining the technique it confirms the relevancy of your neck and also a strong lilkelihood of success with treatment.
Again though, if the “aura” symptoms are constant and deteriorating over time, having ruled out many other sources, I would be happy to assess and “exclude” your neck as the source, but the likelihood is more in favour of other causes.
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