I like my own (posted above) but if all else fails why not just make felafels and shape into a burger pattie?
Aqua faba can be used to bind ingredients if you don't have flaxseed/linseed. And if a regular burger doesn't hit the spot why not spiralise some white and sweet potato, mix in a plastic bag with dry flavourings like vegan bouillion powder and fry, in the shape of a pancake, at high heat. The crunchy noodle edges are something else ... plus, if you have this "pseudoburger" with enough accompanying salad it's not really all that unhealthy, right? ... excuses, excuses.