There is a way to do this. In fact, I'm working on a project right now to do something similar. Depending on your car, of course.
In my Subaru, I've got a carputer. Until recently, I used Cobb's Accessport to monitor OBD. This weekend I got an AEM wideband o2 gauge. Just today I got the aem feeding data to the carputer (in hyperterminal), and the OBD feeding to Cobb's Streettuner software.
In theory Cobb's software should be able to integrate the wideband data as well as the obd 2 data. Although I haven't gotten that far yet. I was sitting down to research that when I saw your post.
That sounds like what you're talking about, right?