Okay I think I managed to somewhat save the day. It's 1am and I have work in 4 hours... but I put them in an insulated box with a hotwater bottle wrapped in some towels. I have a thermostat leading from the box to right next to my bed, with an alarm set to go off every hour so I can quickly check temps and make adjustments if needed. If this rack doesn't arrive tomorrow someone is going to need a massive shoe removed from a very specific "hide"...

Thanks for all the assistance guys!