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It seems like I can just instantiate a new NodeHandle. According to the documentation there is no problem with that:

When a NodeHandle is constructed, it checks to see if the global node state has already been started. If so, it increments a global reference count. If not, it starts the node with ros::start() and sets the reference count to 1.

But still are there any better options and do I need to be aware of anything?

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