Wanted to have everything on one board that could be scaled to account for different configurations.
For a strictly 1 or 2 channel design, the EVAL1 one would save a few bucks, but when we decided to offer 3ch and also have the ability to go up to 5ch in the future, we'd need our own board to be cost effective anyways.
Same thought process as incorporating the 7040SA and offering it in up to a 3ch configuration one day as well.
Having our own buffer board that can be configured and scaled as needed seems the best route. We obviously have this hiccup to sort out but I'm confident.