I've used coconut oil, with good results. My general approach with chicken is to get the seasoning *under* the skin if at all possible (I don't tend to eat the skin, and this allows more flavor to penetrated into the meat). To do this, I usually combine salt/spices with some kind of fat-- olive oil, or butter, or coconut oil. Once I mix it all together, I separate the skin from the meat (carefully reach in there with your fingers, and/or the handle of a wooden spoon-- be gentle so you don't tear the skin), then put the seasoning mixture underneath there.
But srsly, Mike my friend, don't overdo/overthink this. For your first chicken just put some salt and pepper right on the skin, put the bird on the grill, and let the Weber show you what it can do.