I think you might be going in two different cooking style directions here.
First, you really don't need to braise CSRs if you are smoking them low and slow.
Also, I tend to think that braising would wash away any rub on the ribs.
You might want to consider marinating the CSRs in your soy based BBQ sauce for half an hour to an hour then smoke them. You could also pan them with some sauce while smoking which would be braising.
Or you could apply a little yellow mustard to the ribs and then apply any rub of your choosing to the ribs before smoking.
Or, use just SPOG and apply your sauce during the last hour.
Just my 2 ¢ worth. But I would pick just one method.