So I did a test run on a small head I had sitting around that I had gotten meat free, but had never completely degreased.
I picked up a bucket heater off Amazon, that has an auto-shut off feature when it gets to about 150 degrees or the water gets to low. I have been able to keep it in my container with soapy water for a few days straight now and it keeps the water just steaming. Man its kicking butt on that head. I submerged the skull in hot soapy water, and in 24 hours, the water is getting pretty murky with a nice sheen on top. It's cleaning awesome. So far, no discoloration to the antlers.
Yes I know I broke the nose off the deer.
Very impressed with the bucket heater for this. Just make sure theres enough water in the container to keep it running, and let it work.