Buckwheat raw pizza base
Let me approach the question in two parts 1) you want to flavor the buckwheat 2) you need a binder (currently you're using dates). 
My suggestion 1* / use avocado and mash some dried spices (basil, oregano, etc) into it. The avocado is going to be the oil. Do not add any other oil.  2* / try de-seeded zucchini in your buckwheat blend - the idea is to experiment with mushy plants with low water content (thus you need to remove the seeds of the zucchini in this example).
These are theories as I'm not raw but still hope the direction helps :)