Similar to your kale chips I've been making kale crackers, a thicker heartier version that uses many more greens. While I haven't yet used nasturtiums or radish leaves in them I've used many other types of edible leaves with no failures yet. I just recently did a blog about them: https://theartisthomestead.com/a-stupendously-healthy-snack-cracker/
I also have been using large amount of kale and other greens in just about any dish I've been cooking. One that I think will become a future blog post is vegan potstickers. For the base mix of this I've been mincing up 8 oz of mushrooms, one of the large onions often sold individually by the pound (or an equivalent amount of bagged onions), some ground flax seeds, 1 to 1.5 inches of fresh ginger root finely minced, a tablespoon or so of miso paste, and then a bunch of finely chopped vegetables which is where the kale can come in along with many other greens or carrots, or cabbages, even asparagus. This is all cooked up together to make the filling. Then I get potsticker wrappers from the store and go from there.