Greg,
Wouldn't it be best that he lower at least some of the acid using k-bicarb, then sweeten to compensate for the remaining high acid?
Just wondering if there was a reason for just using a back-sweeten and not using k-bicarb also?
Mainly because it would be the only option to do without having to uncork and empty all the bottles. I don't know that I would want to put my wine through that if the benefit wasn't a great bottle of wine in the end.
But I suppose you could add bicarb to each bottle as you open and serve them too.