the refrigrator is not any more "unnatural" than a windowsill!
yes, VFTs dont live in refrigrators in the wild..but they dont live on windowsills either!
IMO, the fridge is much better than a windowsill..
because its the perfect temp, and its CONSTANT..
I know for a fact that when my plants are in the fridge for 3 months, they are deeply dormant, getting a good, proper rest..at 35 degrees.
on a windowsill, it might be really cold one day and 20 degrees warmer the next..and the plants wont be *truly* dormant..
I still say 50 or 60 degrees is far too warm..
at 50 degrees, a plant might "slow down" but it wont go truly dormant..
there is no such such thing as "slightly dormant"..
either a plant is truly dormant, or is still awake but just "growing slowly.."
if you have a truly cold windowsill, in an unheated room, it *can* work fine..
but you want the air around your plant to be in the high 30's or low 40's!!
thats hard to get in a room where humans live..
Scot