When you consider how much less it costs than bottleneck rifle brass does, it starts to be hard to justify the extra trouble you need to go to in order to do it safely. With bottleneck rifle brass the distance to the head is generally great enough that the risk of accidentally softening the head is minimal. With short pistol cases, like 380 ACP, it would be almost impossible to protect the head without a water tray and hard to heat the sides all the way down as fare as the bullet seats to remove work hardening with one. With 44 Mag you are sort of between the two situations, where you need to take some extra care about the head, like a water bath, but at least you stand a chance of annealing it to the depth you seat bullets to. It's just a bit difficult, especially for long, heavy bullets, to anneal it down that far without endangering the head.
But if all you want to do is get the last ⅛ inch or so where the roll crimp works the brass hardest, I think the molten lead method probably makes the most sense. You heat your casting pot to 700-750°F. Dip the case in powdered graphite to prevent soldering, then dip that last ⅛ into the lead and roll your fingers back and forth until the head starts to get too hot to hold onto, then drop the case into water. With rifle cases the water isn't needed, but with the short distance and larger diameter heat path to a head no wider than the brass, I would want to stop the heat from spreading as fast as possible.
I can think of other methods of doing this. The induction heaters are probably easiest, but it takes more technological effort. Tossing and replacing starts to look better when you think that through.