Made these this morning. Very tasty. (I had tuna salad with chopped tomato cucumber and onion filling them for lunch).

I went with the oat flour (a brand certified safe for celiacs) rather than the buckwheat, and I did use ground hemp seeds for half the flax. Oh and a mix of cyclamate and stevia instead of the honey. I made them pretty basic this time so only used some chopped parsley to give them some colour and a tiny amount of minced garlic and onion. I used white wine vinegar instead of the cider vinegar.
I think keeping these proportions using some whole grain corn flour instead of the oats or buckwheat would taste good to (for those that can handle a little corn). Or ground sunflower seeds instead of the sesame.