Has anyone ever used braided hoses to connect a plate? Menards sells some that are for connecting water softeners. They have 1" female pipe thread at one end and a 3/4" push fitting (similar to sharkbite) at the other. It would make connecting the domestic water side of the plate take a couple minutes at the most. Just screw the two hoses onto the plate (they have gaskets so you don't even need to use thread sealer) and cut the cold water line and push the two hoses on.
The hoses at Menards are Watts brand and appear to be rated at 180 degrees. That is the biggest problem I see with using them.
I found some make by Sharkbite that are rated at 200 degrees but they have 3/4" pipe threads so would require an extra adapter.
Also, Menards sells a stainless steel flexible pipe but it is 1" female pipe threads at both ends so would not be as simple to connect to water heater.