Most my my diabetic style baking I've adapted from my previous recipes and I regularly use ground almonds and a variety of nut flours/meals (hazelnut, walnut, pecan, sesame...), but unfortunately I don't get on with coconut flour at all! I make my basic low carb chocolate cake with hazelnut meal, cocoa powder, erythritol/stevia mix and the usual full fat butter, eggs, raising agent, etc. Without the raising agent and less egg and a sprinkle of roasted chopped hazelnuts added for a topping this also makes my shortcake too.
The problem with stevia is that it's so extremely sweet that you only need a minute amount of the pure stuff which means it tends to be bulked out with various fillers - erythritol is fine for this but other options are often very much less suitable, particularly for diabetic use. Early in my T2 journey I was buying pure stevia powder and needed a "micro" spoon (generally used in chemistry, etc) for measuring it, but now I mainly use an erythritol/stevia mix. I've seen xylitol highly recommended for use in baking, but this is a big NO NO if you have dogs, as it's not at all good for them and can be a killer.