Hello,
I concentrate solely on peppers, but I imagine you could combine any other items into the mix that you wanted as long as they are all completely dehydrated. As for the coffee grinder and spice grinder.... I'm not sure. I use the blender as that's the only tool I have for the job. I suspect if you use a coffee grinder you would want to get it cleaned up really good afterwards or you may be in for a spicy surprise some morning!
Thanks for checking out my post!