Do you have a propane turkey fryer? Those burners easily put out enough heat for that; it's what I use for smelting lead but have to keep it on a very low setting.
I can tell you the Lee casting pots are capable of exceeding 1100 degrees. It just depends how the thermo switch inside is adjusted, but you can tweak them by hand if you need to. I make no claims as to the safety of the Lee pots for that use though.
I'm interested in what you come up with; I haven't had to mix raw antimony in my alloys yet but have wondered about it.
I do have and use a propane burner and pot that I use for melting and pouring ingots, I just didn't know if it got hot enough. My pot is a 20 lb. propane tank cut in half. I'll give it a try. I'm trying to come up with #2 alloy.
