For the rest of it's diet, add two or more of the other listed foods at each meal. It would be best if over a month you rotated through all the "other" listed foods.
Do you have wild dandelions where you live? You fed the flower, leaves, and roots. Those are very good for iguanas. IMO the cultivars of dandelion you find in markets are dumbed-down nutritionally.
I would feed an amount equal to 1/2 of the two staples, with the rest made up of the "other" foods.
In case you don't know, kale has been reduced from a staple food to an occasional food.
Have you tried feeding alfalfa a few times/week? In my experience most iguanas don't like it at first. It's a very good food, but your ig can't eat a lot of it because it's so high in protein. For a few time/week, alfalfa is very good.
In your search for variety, you can resort to frozen leafy veggies, and freezing the food when you have access to only large amounts of fresh. iguanas. From what I've read over the years on this forum, igs don't seem to mind the mushy texture of thawed leafy greens.
Freezing reduces only thiamine, as opposed to canning which removes everything. If at some time you are feeding a large portion of it's diet with frozen food, you need to supplement it with just a tiny pinch of a ground-up thiamin pill, only a couple times/week, and not more than that. Because of the possibility of hypervitaminosis, more in this case is not better.
I like your post. You are obviously doing more right than just having a good feeding plan.