If I could afford the time and money and I was smart enough I would get the MD and then do the ND. I wouldn't need to even go get the ND degree. I could just take whatever courses or do whatever self-learning that would help me be a good ND.
In my community there is an Integrative medicine clinic. They have an MD on staff, and an ND. So it's pretty clear you can do the ND-type of medicine with an MD degree if you want to.
One thing that sort of bothers me is that all the NDs in town offer homeopathy. I would think a real MD would be smart enough to know hokum when he/she sees it. They don't offer that at the Integrative Medicine clinic, although they might have some other kinds of hokum.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Heaviest squat: 180 x 2. Heaviest Deadlift: 230 x 2