I use a wet-dry vac to change water!I don't see water changes as a hardship. Doesn't take that long and has some great benefits imo. I do wish I had a setup like yours where I could drain it out a door or window. I siphon into 5 gallon buckets and refill with 5 gallon buckets. That's the hardest part for me. Doing two 25g water changes a month right now normally.
Oh, and I use this on my sump. Best sump cleaning device ever!
https://www.homedepot.com/p/Bucket-Head-5-gal-1-75-Peak-HP-Wet-Dry-Vac-BH0100/202017218
