Ask a Vegan Baker

I am not sure this is the exact correct place to ask this question. I am a home baker that sells at farmer's markets making custom baked goods. A customer wants me to make him a gluten-free sugar free cheesecake. He gave me a recipe that uses macadamia and walnuts, dates and coconut for the base. The dates are too high in sugar for him so he wants to substitute it with something else. I saw the article using flax for an egg re-placer, and wondered if I could use it to help bind this base somehow. He suggested sugar free jello, or plain gelatin. I want to use real whole food if I can. The recipe is 1 cup macadamia nuts, 1/2 c. walnuts, 1/2 cup pitted dates, and 1/4 cup shredded coconut. Any ideas? I may be able to use a small amount of fruit added to this for taste but it would have to be minimal, maybe a tablespoon. Thanks for any help you guys may have, especially if you have ever made something like this.