There is a Posca with a brush tip and good ink flow. The easiest to find is the Pentel, but does not flow that fast so you'd have to adjust the speed. So it mig

There is a Posca with a brush tip and good ink flow. The easiest to find is the Pentel, but does not flow that fast so you'd have to adjust the speed. So it might not be that easy, and require some experimentation...