The Denon interface wouldn’t

The Denon interface wouldn’t be too bad to do what you want. Since you won’t be switching inputs on zone 2, I don’t think you would need to do that but the first time when you set it up. From that point forward, you could just power on. You could also bookmark the web pages for quicker access (reserving an IP for the unit or assigning a static IP).

I don’t really find zone 2 all that useful for my needs currently. The AVR-2112 is a bit limited in that regard as it will not take in a digital source and output on zone 2, but analog works fine so it would work for your application. Denon does have higher-tier models that offer more functionality in this regard.