Convert node to a node of the same type - easy field conversion

I need to change a text field to a link field in on one of my content types. This would be a simple procedure (using the node_convert module) if the convert-to-type option allowed me to convert a node to a instance of the same type. First, I would add a new link field to my content type. Next, I would initiate a conversion, setting the convert-to-type option to the original type. Finally, I would assign all of the fields to their original types except for the soon-to-be link field, which would be assigned to the newly created link field. Once completed, the new nodes should be identical to the old nodes, except for the link field.

Could you allow nodes to be converted to node of the same type?