Copy Repository Within Same NXRM Instance

When we moved from NXRM2 to NXRM3, we dragged with us the old naming of maven repositories. We now want to use the ones NXRM creates as default for maven, and a blob store other than default. We have created a distinct maven blob store now, instead of using default.

Now we want to copy the artifacts between these repositories:
snapshots > maven-snapshots
releases > maven-releases
thirdparty > maven-thirdparty
public > maven-public

Does it exist a script using the NXRM API to copy the artifacts between two repositories on the same NXRM server? Or someone who wishes to share a script written for this purpose?

I can only find something about copy/move from one instance to another instance. Nothing about copying within the same instance.