I've installed dozens of stereos, and that is in fact the configuration on most every aftermarket adapter. In fact, I'd say most stereos have used it as well. It's the empeg that appears to be unique on colors, this side of "the pond" anyways.

I helped put an Empeg into a friend's (mafisto) Celica this weekend, and your list above is exactly how it went. And he says it's working perfectly.