G2know, thanks! 
I want to say that in regards to:
“problem with niagara for my game is that i cannot kill “THIS ONE” particle (spaceship)”
I thought I, once upon a time, saw a tutorial where the guy was doing just that, picking particle X out of the niagara system. If I can find it again, I’ll post in case it becomes useful…
Also, why not one system per-swarm? I’m not super well versed in Niagara yet, but I imagine 10k particles in a system is doable and is not expensive?