How to make a crowd/army

I want make a army with 2000~ 10000 soldiers in same screen.
I saw this tutorial, Simulating Large Crowds In Niagara | Unreal Engine - YouTube
But the bullet in my game is niagara too, and the partical width is changable, that means I should deal niagara colliding with niagara by BP, it will kill performance.
Another solution is HISM, I found the instance of HISM was reused after removing, but I need instance mat hold some “trait” like hurt or damaged, HISM reusing will put some trait in wrong position.
And of couse, I need all soldier has HP and some other property.

Any one know how make this happend?

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