I'm in a similar situation, different predicate. I am disabled so am looking hard at minimizing the physical requirements of frequent water changes. My solution is/will be using an Apex System to auto change the water, sourced from 2 45 gallon storage tanks located in the laundry room and piped via pvc through the basement to just under 4 tanks (2 120 displays, 1 65 breeder/quarantine/grow out, and 1 45 gal medication/emergency tank). Drainage will be parallel to the feeds with pvc tied into the drain. All tanks located in family room or kitchen. The 3 largest with sumps.
The apex system can pump about 4 gallons/hour. Each tank will have its own pump unit. I plan on changing about 20%/day and adjust stocking levels on the basis of what this can support. Alternately, if my water stabilizes within 12 hours of aging I can up the rate to ~ 40%/day. The initial cost and installation is certainly a pain but should be fairly automatic once up and running, with the only required task being filling the storage tanks every day to twice a day, and periodically rinsing the mechanical filtration in the first sump chamber. You can also make tank filling automatic, but since manually adding a dechlorinator is required, minimal juice for the squeeze.
I assume you are thinking about adults rather than growing out juveniles which almost all agree need large daily water changes to achieve full adult growth.
Also, given that doubling times for potentially pathogenic bacteria is measured in hours to 1-2 days, weekly water changes ensure a high bacterial load in the water column. My fix for that will be uv sterilization, you may want to consider as discus come from an acidic low bacterial count environment.