How about just keeping two dishwashers? One starts full of clean stuff and you use it like a cupboard, taking stuff out of it as you use it. The other starts empty and you add stuff to it after using it until you have transferred everything from one to the other. Then you run the full one and start again.

Ours is a Fisher & Paykel dual dishdrawer, which does exactly that, in the space of a single unit.

I saw this "hack" on instagram or something and if I ever get a kitchen big enough for two dishwashers I fully plan on doing this.

Doesn't really need two dishwashers, just two set of racks and a cupboard that can accommodate the other set.