Sorry you haven't had any replies yet.
One downfall I see is that your top off reservoir may run out of water if you don't fill it in a timely manner. Also not sure if display tank water has the potential to backflow to your reservoir during a power outage?
Have you considered just using a dedicated water line with a filter combo that would treat for chlorine or chloramine depending on your water supply and either an electric operated solenoid with a timer or irrigation setup with a controller?
One downfall I see is that your top off reservoir may run out of water if you don't fill it in a timely manner. Also not sure if display tank water has the potential to backflow to your reservoir during a power outage?
Have you considered just using a dedicated water line with a filter combo that would treat for chlorine or chloramine depending on your water supply and either an electric operated solenoid with a timer or irrigation setup with a controller?