I'm not surprised you were annoyed! And we've all been brought up to be so respectful to HCPs - it's difficult to make your point firmly without seeming to be rude!
Do you keep a food-and-tests diary? Do it for a week, eating as you are now and testing as they recommend on here (fasting, pre-meals, 2 hrs post-meals and bedtime). Record your food intake and your readings.
Then maybe do a day eating as the nurse recommends, testing again as above, and record what happens to your readings. I shouldn't think one day will do much harm, but someone who knows more than me will say if I'm wrong!
Then go back to your practice nurse and/or doctor armed with your results, and make your case. You could do it when you go back for your HbA1c results, which should help to reinforce your argument
I feel I'm very lucky having a practice that issues meters and strips as a matter of course to all their diabetic patients. But I'm pretty sure I'm going to have trouble getting as many strips as I want, even so. The diabetic 'specialist' said test a couple of times a week. Ha! I haven't pushed it yet. I've bought extra test strips on ebay, checking the items with care for use-by dates etc. Most ebayers put that sort of info on. But when I go back to the surgery I shall ask how many they are prepared to issue.
The last batch I bought (my practice issues Freestyle Lite monitors) was less than half price.
Let us know how you go on!
V