Spreading particle flow

I want to spread particle flow from one concentrated point into nice braces shaped ‘fan’ sketched here in blue and terminate with rolling around the wide bar visible at the bottom. The last part is not a problem, but I cant make the particles to form widening ‘fan’ shape. There are 4 turbulence force fieldds, and the bar has force field with negative strenght to attract particles.

Is going with lots and lots of guides the only option or are there some alternatives?

The closest thing so far is using keyed physics and two planes with different initial velocity. But that eliminates free particle movement around bar at the end.