This is very interesting! I have heard of some tricky and rather scary ways people have stressed their plants intentionally.
Ice bath the last watering and let them dry out the last two days with total darkness (normal).
Also, (Scary) have heard of one case where the garden would be in the last two weeks of flower and infest a plant with spider mites off site and cover it with a small mesh screen where they cannot get out. He would then throw the plant in with the rest. The infected plant would put off a hormone that would alert the other plants to prepare for infestation. The uninfected plants would push more resin out as a defense. I have not heard of a second person doing this, however I see the snail slime maybe doing the same thing. Not sure if it will work but is always worth a try. And there would be no worry of growing snails from the slime and having an issue from that.