@duerer I haven’t tried this, but Daniel Bysted explains here: https://www.youtube.com/watch?v=oqjKMd9CYI4 how he does it. (from around 15.00 min. but of course it’s worth watching it all.)
Basically using hair cards, but in stead of curves to guide the hair cards, he uses a Hair Particle system. This means he can groom the hair cards and I guess Particle Physics should also work.