the liquid from cooking chick peas is a binder? I will definitely try that.
I don't have a recipe for egg vegi burgers. I tried that years ago.....haven't done any of that recently.
Had a heart attack a few years ago, had to give up cheese and still learning how to be vegan.
still eating too much carbohydrates, but not as much as I used to.
It sounds like you have a lot of parameters to making a veggie burger, especially one which is light and also easy to eat with dental issues.
You mention that you had a recipe that worked well with egg, could you use Aqua Faba (the liquid from a can of chickpeas) as a binder instead of egg? Maybe that could give you the lightness you want? The Facebook group Vegan Meringue Hits and Misses has several in their files you could look at.
Good luck finding a great recipe!