I have found a source of literally hundreds of recipes at https://www.diabetes.org.uk/Guide-to-diabetes/Recipes/. They are sub-divided into various groups, e.g. ‘Sugar Free’, ‘Gluten Free’, etc.
My main problem is that most cookery books use non-metric measures – a teaspoon of this or 1/3 cup of that, etc., particularly so with American publications. I always use metric and weigh everything. I use the UK ‘back of pack’ nutrition information entered into a database from which is extracted accurate energy and nutrition for the quantity of each food item used.
Since we are dealing with a small quantity of 800 kcalories per day, variations in ‘traditional’ measuring items – cups, spoons – from one country to another could result in a greater or lesser proportion of the 800 kcalories required.