Hi,
so far I haven't found any standard way for this. In a similiar case we developed an ABAP programm to do this by using the function modules RSZ_X_COMPONENT_GET and RSZ_X_COMPONENT_SET_NEW. The first ones take the definition of the existing query, the second one then creates the new query on top of a different provider. In between the ABAP makes the necessary changes like the existence check for CKFs and RKFs.
However, this is not really straight forward and also pretty indiviudal because of different naming conventions and so on. But it is possible.
Best regards,
Stefan