Help adapting render target to pivot painter system

How can I adapt this render target system( to my pivot painter 2 foliage system?

My foliage system(copied from content example and adpted to pivot painter 2):

What I need to do:

The shader that I create following the tutorial mencioned:

I need to adapt the render target to work in the pivot painter 2 shader because the render target works with multiples actors and I can create trails and other things with it.

Any Ideas?