That sounds like an interesting and tasty approach, but I don't see any advantage to drying with the spices in it, it's easy and light enough to just bring some spice with you. You could likely improve the flavor by also bringing olive oil or ghee with you to add to your dish on the trail: lots of richness and calories with a good calories-to-weight ratio.
On a simpler note, I usually bring ready-made instant hummous that I get at the health food store. Nile Spice makes it, but I usually get it in the bulk section. Requires only water, but much better with a tablespoon of olive oil added, or olives or cukes if I'm not worrying about weight.
It's such a light weight, nutritious, and easy thing to use that I have wondered if I could mix a little of it into other dishes for flavor, like couscous or something. If anyone has suggestions for vegetarian meals using instant hummous, I'd be interested to hear. But homemade chickpeas plain sound great to use.