It seems I got he wrong impression from the Flow Nodes. These are usable.
Create a new particle, take note of the entity name when in the scene.
Define a particle attribute, in the particle editor click the cog wheel "Show Effect Options". Here you can define your own attributes to be used as values for the various particle effect parameters.
For the flow node simply get the entity by name "Entity:FindEntityByName".
Create the flow node "Particle:AttributeGet" and set the Attribute field to the attribute name you created.
Link the nodes with a trigger.
Note: If the attribute does not exist, the Error out port will be triggered. If there is no entity assigned to the flow node, no error will be produced and of course, no value either.
Sorry for any confusion caused.
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