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I think if you wanted to go for the pitch-the-next-day method you'd be better off putting the lid on the boiler and leaving it in there overnight. You can be pretty sure the boiler is going to be sterilised from boiling for an hour. It's just the matter of trying to sanitise the lid. If you put on the lid immediately at flame out the steam would probably sanitise it (wouldn't hurt to spray it with starsan before hand). I think this would be the fastest way to cool it to room temperature. Putting 20L of boiling wort in the fridge will probably just cause the fridge to act like a thermos and keep the whole thing warm despite the fridge cranking non-stop. If you left it overnight in the fermenter and then put it in the fridge in the morning to finish it off to get down to 18 degrees or whatever would probably be the fastest way.  But really overnight in the boiler is about the same as one run through a counter flow chiller (10 minutes max) and into the fermenter; it might not get it down to pitching temps in summer but a few hours in the fridge after probably will.