Is There A Way To Update A Single Particle's Location In A Niagara System?

For sure!
The niagara graph is pretty simple. I made a scratchpad and added it to the Particle Update.

Inside the scratch pad I made a variable called Scratchpad Array and binded it to my User parameter called ZombieLocations which is a vector array which I set on tick from a blueprint.
The scatchpad graph:

I hope this is how you bind parameters inside a niagara system.

The user parameter is receiving the values well but when it gets inside the scratchpad it reads everything as 0.0.0.0

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