Ok time to go from bee haver to beekeeper. This is a advanced type of rescue called a cut out. Below is a video of me teaching how to do a basic cutout.
I would go to Mann Lake in Woodland, Ca to get the hive parts. They don't have warre but for your first cut out a warre is tough. If you go foundation-less with a 8 frame Langstroth box it will be close in size to the warre and then you could add a quilted top cover. If using warre zip ties work well to attach the comb.
What is the likely hood this hive will swarm? ie should we focus on trying to capture a swarm?
• Hive may abscond meaning they leave altogether but this late in the season they may try and stick around. With so much exposure it is tough for them to protect from robber bees, yellow jackets, ants, rain and cold.
If the hive doesn't swarm, can we entice the hive to move to our Warre hive? What are our options?
• If you take out the baby bees, and all the comb the bees will follow. You could also try to smoke them up but bees are reluctant to leave established comb.
If the weather holds for a couple of week's how long do you think we have until the hive collapses?
• Rescue as soon as possible as every day any brood they can not keep at about 95 degrees will die, if they are not already at some point they may come under attack and that will cause them to increase there defensiveness.
I have done many of these types of removals. You can post on craigslist or search the internet to see if there is anyone who offers "live bee removal" in your area. You could pay a little to have a local expert help you. Let me know if you have any more questions.