There are many AVRs that allow you to save/load a config file via a web interface (although it is usually a painfully slow process, ~10 minutes or so). Alternately, there are many AVRs that allow you to control channel levels via an app...slightly easier than how you are doing it now, but still a pain.
If it was me, I would just live with the less-than-ideal sound at one location and optimize the system for where I spent the majority of my listening time.
If it was me, I would just live with the less-than-ideal sound at one location and optimize the system for where I spent the majority of my listening time.