As long as you're using gluten free oats, any recipe should be fine I would think.
I've never used a recipe - just mixed to taste oats, salt, sugar (white or brown, depending on type of fruit), and whatever spices or not were appropriate. Sprinkled that over top of the fruit and covered with slices of butter or coconut oil.
people seem to use different names for all these things.
You could use GF oats, or even make a crisp type topping with GF flour, sweetener, and oil. You could get fancy with different types of flour if you wanted to, as well. But personally, I think oat flour (just oats, whizzed in the blender) mixed with whole oats makes a great cobbler.
thinking about how you are going to sell these things---
sounds like you need to make a fruit bar type thing- so use half your flour/oat business on the bottom, baked into a crust, fruit on top of that, then the rest of the flour/oat stuff on top. then you can cut them into squares and wrap them.
I have a "fruit cake" recipe I make with whatever is seasonal that suffers all sorts of substitutions very well. It is not this recipe, but the proportions are very similar https://fromthefarm.ca/2010/08/02/french-peach-cake/ and I`ve used rice and oat flour and it comes out really well.
Note the large amounts of fruit used. If you are using plums or peaches it can get a bit wet (you can flip the pieces upside down when you serve it, which helps) but but you can wrap the pieces in wax paper. People go NUTS for this cake.
I add spices (to replace or add to the citrus zest) depending on fruit I`m using. It is really a fabulous recipe that highlights the produce of the season.