Wow, talk about a blast from the past!
I haven't tried Brown Sugar Splenda because I haven't used any Splenda since about a year after posting this. I imagine it would be fine, but just can't say for sure. It wouldn't be hard to test on your own though. Just take a Country Style Rib and coat with some Brown Sugar Splenda and Salt, then cook it the way you normally cook.
This thread came up at the AR too, so I guess it was doomed to get bumped again!