On the Living With Iris there is a thread about this doorbell and a number of people have rung in with their desire to see support for this device in Iris.
Using this doorbell with its 100 sound file capacity and being able to have various events trigger playing various sounds would be a great addition to Iris.
Yes, if you can't get the built in feature of the existing cameras to work, this would be acceptable.
I'd prefer the camera's built in two way audio as well as having the doorbell. But considering that "local processing" still hasn't been finished almost a year after the V2 release, I'm skeptical of anything remotely resembling this.