I finally found a Kettler Navigator tricycle on craigslist and it was delivered on Thursday last week.
This particular model has a push bar that can steer the back wheels of the tricycle and the front wheel can lock out, basically turning it into a cycling stroller. I installed a three point harness (not shown in photo below) over the weekend so she’s strapped in as well as with her other stroller.
Harper Sue likes it much better than her umbrella stroller since she can turn around and see me and has full peripheral vision. Not to mention that it makes her look like she’s riding a bike