Since it's Sunday, this tip probably won't be effective, but:

If you can locate a small bit of dry ice:

Heat the entire area around the drain plug with a propane torch. You don't need it too hot. Just get it warmed up pretty well.

Then, with a gloved hand, press a piece of dry ice on the head of the plug and hold it there for about 7-8 minutes. If the piece evaporates, then get another piece. Press firmly against the plug (gloves!!!). The dry ice will "scream" as it evaporates. Don't let the ice touch the oil pan.

The 7-8 minutes is just a guess. The head of the plug should be so cold that it forms frost on it from the humidity in the air (well below 32°F.)

Hopefully the oil pan remained above 100°F.

With a 100°F. differential in temperature, the plug should come right out.