HI Kris-
Dupytren's runs in my family. As you may already know, it's genetic, and indicates nordic heritage. It mainly shows in men, though women can get it (Iron Lady Margaret Thatcher being one famous example). The more a person uses their hands (esp hard use like trades) the more the Dupytren's contracture will typically progess.
There is surgery to release the scarring (this is a lot of down time and usually you get some scarring/fascial adhesion from the surgery itself). Needling, which is a newer approach, is a better option. My uncle and Grandfather had the surgery, my Dad had the needling (his developed later because he didn't do as much manual work, needling wasn't available when the other two needed treatment.)
In terms of prevention, frictioning over the adhering tendon to keep them mobile should actually help if you you do it at least daily. Most people just don't stick with it.
Cold laser potentially -- no one in my family has tried this, but I would look into it if it were me. Treatment costs would add up there though.
Probably the anti-inflammatory diet, if followed strictly, would help slow adhesion because the whole process is mediated by inflammation. Less inflammatory conditions in the body, less adhesion.