Considering a rhinoplasty - Is it possible for the radix to be widened?

Without the benefit of physical exam and posted photos- it's difficult to comment accurately. l suggest that you seek an experienced Board Certified PS and discuss your options during your consultation.

You are correct that most of the time the goal is to narrow the bridge. Without even seeing pictures I can tell you that trying to widen the radix is not going to be a good idea. I’d be surprised if you found a surgeon to do it.

Nasal grafts are typically used for people who want more nasal tip and dorsal projection. This will provide a more prominent nose up to the bridge but honestly it’s difficult to widen a radix from my experience

The Radix of the nose is attached to the frontal bone directly below your brain, and is really going to be impossible try to widen that specific area. It is possible to widen the midportion of the nose with spreader grafts. A full set of facial photograph from all angles are required to make a determination about how best to proceed.