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I was able to evaluate launch arguments in a custom function outside of the LaunchDescription by using the OpaqueFunction launch action feature which takes a context as an argument, see this link:

https://github.com/jrgnicho/collaborative-robotic-sanding/blob/3902e4f0e76bde226b18a997fd60fc30e1961212/crs_application/launch/perception.launch.py#L21

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