As one (expatriate) Kiwi to another . . good on you! That's fantastic, and so easy, eh!
You mention staying "dextrose" free. I presume you meant fructose-free. Dextrose is a form of glucose and is an excellent substitute for sucrose (cane sugar) in recipes etc.
Which book(s) of David's have you read? Sweet Poison Quit Plan is probably the best one to start with. But Big Fat Lies is well worth reading too, especially in relation to polyunsaturated fats.
Please keep us posted on your progress.
JohnN