If you can buy sunflower seeds in bulk, it might be worth looking at making your own sunflower seed butter. I haven’t tried it but am told it’s really not that hard. You can either leave the sweetener out or replace with something you can tolerate with keto. There are several options.
Let us know if you try it and how it turns out.
http://www.geniuskitchen.com/recipe/how-to-make-your-own-sunflower-seed-butter-422938