That should be a fun trip.
The local habits will have a lot to do with where the elk are in December so I wouldn’t put a lot of trust in generic elk hunting information being all that useful. For instance if snow pushes elk out of the high country they have established travel routes that haven’t changed much in 100 years and the amount of snow has a big impact in how close to winter range they are along that travel route, and they will be much more bunched together than any other season. Some elk go quite a ways, some hardly at all. It’s safe to say the locals always know the general locations to look and how close they have made it to winter range.
Same for sagebrush elk - as the days grow shorter they will gravitate to the same winter draws they always use, maybe not far away. It’s kind of like hunting antelope and a little driving and glassing up draws in the right spots quickly turn up hooves. The only guys not filling a tag are the ones who haven’t bothered to ask a local and spent time in the wrong area.
One popular area has a fairly easy to access travel route out of the mountains and elk will bunch up right before a fairly open bench, then small groups will run the gauntlet to the other side while hunters blast away. The successful hunters drag their elk downhill to the road and before long another small batch will make a run for it and the cycle continues until the end of the season. The key to success here is simply wear warm clothes and sit near the bench like a duck hunter waiting for a flock to fly by. The only guys not filling a tag here either just had a baby, or were given last minute tickets for Hawaii.
A little local knowledge goes a long way.
Edit: I just remembered this American Hunter article.
Reasonable draw odds, high success rates and filling the freezer with tender, tasty meat makes cow elk hunting a great option. Here are some tips and tactics for hunting them in the late season.
www.americanhunter.org