Node instancing or similar?

Hi all,
Is there any way to instance a node, so I have a master that controls instanced/cloned nodes?

When its something simple, i’m using extractor out to multiple copys of the node,

But in this case I’m not sure how to instance the node correctly.

I have a bunch of these groups of nodes, and every time I want to change the expression, I have to select every one. I cant just have a single master expression node as there is no text / string input. And if i had one expression node for all, I couldn’t have unique input to each group.

Any ideas to be able to do this?
Any help appreciated.

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