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Hi, I think, I don't understand your problem completely. You want what topic remapped to what node? In your question, you were talking about to publishers.

Generally, when you want to remappt a topic, use something like this:

rosrun <package_name> <node_name> <old_topicname>:=<new_topicname>

As I understand your question, it should be something like this:

rosrun <package_name> /whycon <old_topicname>:=/main/image_raw

But maybe I didn't understand your question right.

Best regards.