Here is something that will at the very least get you started.
http://www.businessprocessincubator.com/bpmn-2-0-modeler-for-visio.html
This free BPMN 2.0 Visio modeler will let you model BPMN 2.0 Choreography Models and you can then use this service to convert (export) them to BPMN 2.0 XML
http://www.businessprocessincubator.com/convert-a-microsoft-visio-file-to-bpmn-2-0.html
Disclaimer.... I work for the business process incubator! ;)
Simon
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