So, you need an Index to refer to.
your hit results from before will return an index value if they hit a component of an HISM. Its one of the pins out of the hit.
You could combine what you had before to this.
Using the ID you can isolate the element to work on.
Then you just change the scalar or color value in BP like you probably did before.
Collisions are a bit hard to understand at first, but if you keep trying things you’ll get it. Its a different approach to go about, but it could be better in terms of performance and practicality.