Update Wsdl binding style with retaining the message content

We have bunch of projects created in 'rpc_literal' wsdl binding style. We would like to migrate all the existing projects from 'rpc_literal' binding style to 'doc_literal_wrapped'. i.e Updating the wsdl binding with the existing soap request.

I tried with the 'Update Definition' with options of creating new request and keeping the existing values. This does not update the wsdl binding. How ever when I choose the option' update all requests' in the update definition window, it updates the wsdl binding but message content cleaned.

Is there any way to update the existing rpc_literal binding style project to doc_literal_wrapped project without clearing the existing message properties?