If by natural cat litter, do you mean pine pellets? As cat litter, pine pellets are crazy expensive. The same product is also sold as horse stall bedding for $6.50 for a 40lb bag. I believe some here have used that for chickens? But wet it first so it’s in saw dust form. Seems like that would not solve your dust problem. I use PDZ on my poop tray and it is dusty - I wear a mask anytime I scoop it. Pine shavings and hemp have both not been dusty for me as coop bedding, as the material itself - but chickens themselves generate a lot of dust, in addition to what blows in from outside.