I'm a fan of black latex glove fingers gorilla taped over the muzzle (unless in super thick country). I'll tape my BH209 tubes closed with the same tape, allowing me to add another glove finger in a pinch. Could be done without glove fingers and only electrical tape. Sometimes electrical tape...
What part of the state will you be in? We've see the rut center around Thanksgiving in SE Colorado, with action into the first week or two of December.
How many tags are in your pronghorn unit vs public land access? We typically wait until the 2nd week of season to let the opener crowds disperse, but that's in a crowded unit. On a cold year pronghorn can start to group up in mid-late October, leading to a harder stalk and less clean shot...