deffinitely agree with the suggestion to plan ahead. Design your entire system and it's plumbing with the thought in mind "how do I plumb the system for a hose free water change?"
With some extra PVC
, valves etc, you can pretty much set your system up to almost do a water change for you. Simply shut off your auto-top-off, open the drain valve on your plumbing until you've drained out what you need. Close the drain valve and turn on your pump to refill. Once your tank is back up to normal level, shut off the pump and turn your auto-top-off back on.
If you're building the home and the entire system from scratch there's no reason it shouldn't be that simple.