That's exactly what I need.You mean something like this?
Push and pull bars with a steering link across the two wheels giving Ackerman angles. If so then yes such a system can be employed on any tadpole trike including the Streetfox. As to how you need to set up the steering link first as per the std Streetfox then make the top arms on the uprights. Note how much the top arm moves from lock to lock and then work out how much bar movement you'd like to have to operate that movement range bearing in mind the bar lengths above and below it's pivot. IMO it's much nicer than dropping bars into the uprights and moving them left and right and feels fairly similar to under seat steering which the Warrior uses.