Ever seen oil boiling? I haven't. I'd like to keep it that way.
Did you get anything close to the dual oil pan idea? Just wondered if you'd tried it out yet, or if you were going to at all.
If you can get ahold of another oil pan, it might be interesting to first add heat sinks under the windage tray from the bottom of the pan (so that the oil surrounds them), then affix a heater pad or something to the bottom of that pan. The heat sinks might make for a better dispersal of heat through the fluid, helping to warm the engine with as little heat loss from the element as possible.
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