My bad, I misread your post.
I don't have an answer on why we were told two different stories. I'll look into it over the next couple days, in the mean time perhaps mastercraftdave will have tested.
On the direct wired bypass, if the software permits the piggy backs, you could undo that work around and use the profiles to manage the different amounts of ballast filled/drained per rider. My understanding was that the bag and the hard tank appear as one ballast in the touch screen interface with the latest software and timer config updates. In this case, you'd just setup a profile for your wife to fill the ballast 30-60% depending on the size of the extra ballast bags. All assuming that what I was told was correct.