No bud you are trying to get a reduction in waste charges.
So in 12 months time you can say 650,000L was my waste from RO. This was either recycled or used to water the garden. So the meter needs to go on WASTE outlet.
You wont get 100% reduction in waste because you will still have some in your house.
Just remember its for YOU to prove you are not putting this "waste water" down the drain.