Wanted: DD marriage

I don't have a DD relationship, but I want one.

Pros:
   1) Most couples who try it find that it revitalises their marriage and puts it on an entirely different footing.
   2) I would like to improve our standard of living.  By that I don't mean spend more money on gadgets or try to keep up with the Joneses; I mean have a cleaner, tidier, prettier house; be more considerate of each other; enjoy each other's company more.
   3) I really enjoy reading the blogs of many women and men in DD relationships and feel inspired by them.
   4) I have never been afraid to spank a woman.
   5) My wife is showing signs of being willing to follow the housework schedule I drew up for her recently, as she really had no idea how to keep the house clean.
   6) We have managed to stay married to each other for 22 years (she is my third wife.)  Sometimes the outlook has been bleak though.

Problems to overcome:
   1)  I am not a very dominant man, in fact I dislike controlling people and telling them what to do and what not to do.  In addition I am diffident and inconsistent.
   2)  My wife is not a very submissive person and she can tell me nothing about her that she wishes to change or improve.
   3)  I am not a socially savvy person and have little idea of how or when to be tactful, when to be assertive etc.  No doubt all those whose blogs I leave comments on will confirm this!
   4)  My wife and I have very different backgrounds and come from very different cultures.  Her parents' house, as she herself remarked to me, was dirty.  It was also of poor quality, built largely of second-hand materials, shabby and leaky, dark and cramped with insufficient lighting and inadequate drainage, no glass in the windows. The house I grew up in was attractive, fairly spacious though old-fashioned, with a large garden that was my father's main interest in retirement and a great place for me to play.
   5)  I have always had a good appetite for sex, although now that I am well into my eighties, that appetite is fading somewhat; but my wife is quite happy to do without it altogether (she was a virgin when I married her at age 32.)  However she has always been willing, if sometimes not very cooperative, and occasionally she has even been enthusiastic.

So, the big question is, How do I go about this?  I must say that looking at what I have written, it doesn't appear promising.

Anyone with helpful ideas is more than welcome to comment.