wow, that sounds like a pretty good idea... I dunno if widebands are more sensitive to fouling than the avg o2 sensor, but if it's longevity is the same (w/o a significant drop in accuracy) seems like a good deal.
This really sounds like a FA kind of question tho, I think there's only maybe 4-6 ppl here that could answer that from actual experience...
...which of course means, you'll prolly get lots of replies that say
"well I heard that...."
or
"I know a guy that..."
blah blah blah
Let us know what u find out tho, and if the setup works well, I'd be interested in emulating that setup... I'm still on the fence about computer upgrade vs retune.