While I'm not seeking discipline, I too have a vanilla husband (he's from Quebec so I call him a French Vanilla

) who seems to think I'm a little off my rocker. And actually, I have a disorder [OCD] which can easily stand in as a scapegoat for my kinky leanings. I had to convince hubby that I did not need to be cured of my bottom-ism; like Dr. D, I also tried to literally and figuratively throw away my desires, only to have it hit me like a tornado later on.
The mission took a different turn when I began to see hubby's own subby side emerging as I opened up to him, which is sort of touching but sort of frustrating at the same time. That's not quite the direction I was hoping for things to go!
I'm very grateful that he was open, after much discussion, to letting me explore this on my own and seek out others like myself. I know that a lot of partners are not able to be comfortable with that. I know how lucky I am.
As hubby and I are both in a line of work which involves a lot of behavioral management, I've sort of taken this mental turn from wishing he were a top, to working on desensitizing and conditioning him to come along with me on this ride, and in turn making a conscious effort to be attentive to his needs as well. THIS is very important! Even a DD relationship is a two-way street; Doms have needs, too. It's maybe not Dommy to admit it, but there are reasons why they seek out these relationships. There are personality aspects at work which are directing these leanings.
Your husband isn't a natural, so you'll have to be patient in finding ways to compromise and encourage him as you walk together on this journey. It's hard to be patient, especially when emotions are so involved in the mix.