The answer I got was yes, but to use a 2qt one, instead of the big ones people use for smelting, since you want to expose no more of your molten alloy to air than necessary and it is plenty big enough for all but the highest volume casting.
I ended up getting a very heavy stainless steel restaurant grade double boiler top of the same capacity, because it was even deeper and narrower, it had handle ears on which to rest molds, and it cost less than 1/2 as much. Works well.