I just realised I missed something in my last post. I was meant to attach a link: https://tdeecalculator.net which helps you calculate calories. It is pretty good. My post made less sense without it.
I think what you are doing seems reasonable. Just don’t want to get too hungry as that is a quick way to lose motivation.
Losing weight and improving diet can often take you out of the realms of borderline diabetic. That has got to be a good thing. In fact a good diet can reverse type 2 diabetes. That is can not will. I have been seeing a very good diabetes consultant who speaks highly of diet (I am not diabetic, but have another non-diet/exercise related endocrine issue) in reversing diabetes. He is a key researcher in the roles that exercise and diet can play in the prevention and management of the metabolic syndrome (a combination of diabetes, high blood pressure and obesity). A good diet and some moderate exercise can help in all these areas.
You obviously don’t want to become diabetic so good luck with it all.