Did you talk to your osteopath about what you are thinking about the moro reflex? I wasn't sure if I missed that in your post. If not, she would be a good place to start as it may give her further insight in relation to your dc generally and she may be able to recommend a doctor.
I would like to say, by the way, how lovely it is to read the care you are taking, and the lengths you are going to.
In relation to your praise of the osteopath, a world renowned psychiatrist has recommended cranial osteopathy as a therapy for trauma, ie neurological issues.
One of my dc had muscle weakness, in relation to gross motor skills not fine motor skills, and by about 20 months was visibly frustrated at their own inability to walk. They only just met milestones.
When I looked at therapy for neurological issues affecting gross motor skills (dc was 12 months at the time) I found it was massage, nutrition, exercise. I was very determined to do all I could, and cooked up different nutritious stews every day and mashed them to make it easier to eat. Once they started walking I started taking them to gym and the playarea, long walks, lots and lots of encouragement (aka bribery).
At 3 they found it hard to climb above 2 ft and jump but after 3 cranial osteopathy sessions they were able to climb the 4ft bench and jump onto the soft mat. Gym teacher was very pleased, I was so happy I had tears in my eyes!
They are now fine, strong and agile. I also don't know if what i did made a difference, though I don't care either, so very glad I did it.
I also found out as much as I could about brain development. More information about this should be given out to parents as standard. The brain is hardly formed at all at birth, and develops apace, something like 80 percent developed at 3 and more fully developed, but still capable of changing, at 6. The sort of stimulation provided in the early years will affect the intelligence, the emotional stability, how interesting they are, character, etc etc. I also found Montessori - Maria Montessori was the first female doctor in Italy, in the early 20th c. Once qualified she set up a school for children with learning disabilities (referred to as retards), and she found with her techniques and equipment which she designed that the children could reach the same standards as the NT children or exceed them. She was very critical of formal education at that time.