JIRA4 already has a SOAP service that exposes the progressWorkflowAction function. See https://docs.atlassian.com/rpc-jira-plugin/4.4/com/atlassian/jira/rpc/soap/JiraSoapService.html#progressWorkflowAction%28java.lang.String,%20java.lang.String,%20java.lang.String,%20com.atlassian.jira.rpc.soap.beans.RemoteFieldValue%29
You will find examples of this if you search in Answers.
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