Camel CXF generic producer before 2.8.0

[Andrei Shakirin]

Hi,

Is there any way to avoid expected message part checking (CxfEndpoint.java) in 
2.7.3?
skipPayloadMessagePartCheck option was introduced in 2.8.0: 
https://issues.apache.org/jira/browse/CAMEL-3778

Anyway, just it means that there is no way to implement universal CXF producer 
in Camel before 2.8.0 (analog to CXF Dispatch interface)?

The use case is following: I need generic Camel CXF producer, that can speak 
with any external web service.

I defined a generic interface:
@WebServiceProvider()
@ServiceMode(value = Service.Mode.PAYLOAD)
public interface WebServiceFacade extends Provider<Source> {
    public StreamSource invoke(Source message);
}

and specify route:
<camelContext xmlns="http://camel.apache.org/schema/spring";>
  <camel:route>
   <camel:from 
uri="cxf://http://localhost:8197/FlightReservationService/?dataFormat=PAYLOAD&amp;serviceClass=de.camel.test.WebServiceFacadeClass"/>
   <camel:to uri="log:TestLogger"/>
   <camel:to 
uri="cxf://http://localhost:8080/sbb/services/Invoke?dataFormat=PAYLOAD&amp;serviceClass=de.camel.test.WebServiceFacade
 "/>
</camel:route>
</camelContext>

Camel successfully receives incoming message and logs it. After it, before 
sending,  Camel tries to compare message parts from the incoming message with 
MessagePartInfo from the WebServiceFacade interface. Of course they have 
different names : {http://test.camel.de/}invoke from interface and {xxxx}yyy 
from message.
Therefore Camel throws exception: The PayLoad elements cannot fit with the 
message parts of the BindingOperation. Please check the BindingOperation and 
PayLoadMessage.
Questions:
1) what is the reason of this validation? Basically root payload element can be 
not the same as web service method name (it is required only for wrapped style, 
but in case of using ws-addressing they can be different).
2) is there any other possibility to provide universal CXF producer in Camel 
before skipPayloadMessagePartCheck was introduced (analog to CXF Dispatch 
interface)?

Regards,
Andrei.