I ran a bar on my street / drag bike a long time ago. A couple of cons to consider (or pass on to your wife)
First, many states don't allow bars on the street. I have one ticket in NY to prove it.
More importantly, you will probably have to run a strut and they stink on the street. With a strut and bars, its ulikely that you will get a shinko to hook. Most bar bikes run slicks at low pressure, and the slick provides the compliance required to keep traction on the track. Without that compliance, the bar will unload the rear tire, and you will light the tire right up. As the tire spins, the bike comes down off the bars and if it goes sideways it can get ugly if a wheelie bar wheel catches.
Unless the bike is much lower and has a slick, I would argure (to your wife) that the bar makes it less safe.