Thats a lot of work, and a lot of PWC
. Hypothetically it's possible, but I think it might be easier to build a time machine, travel to the future, and come back with a robot to look after your tank for you.
Seriously though, thats a lot of work doing water changes, and a lot of salt down the drain. Depending how many fish you have, the tank may eventually cycle from the bacteria growing on the glass and substrate, so if you really wanted a tank that "never cycled" you'd have to clean it out every once in a while to get rid of the cycling bacteria.
I love hypothetical questions. They can be fun to ponder