Placing XSLTInInterceptor after signature validation

I am using Tomcat 7, CXF 2.7.14 and Spring 4.1.4.RELEASE.

I want to place a XSLTInInterceptor after the signature and timestamp was validated.

Background: the body of the message contains a element with a wrong namespace, which must be replaces, before the unmarshalling happens. Right now I am getting the "unexpected element" error message.

My cxf-servlet.xml

<jaxws:endpoint 
    id="SecurityTokenService" 
    implementor="SampleSTS" 
    address="/SecurityTokenService" 
wsdlLocation="WEB-INF/wsdl/ws-trust-1.4-service.wsdl"
xmlns:ns1="http://ift.tt/1oKkWnD"
serviceName="ns1:SecurityTokenService" 
    endpointName="ns1:UT_Port"
>
    <jaxws:properties>
        <entry key="ws-security.is-bsp-compliant" value="false"/>
        ...
   </jaxws:properties>
    <jaxws:inInterceptors>
        <bean class="org.apache.cxf.binding.soap.saaj.SAAJInInterceptor"/>
        <ref bean="WSS4JInInterceptor"/>
        <ref bean="intransformation"/>
    </jaxws:inInterceptors>
</jaxws:endpoint>

...

<bean id="intransformation" class="org.apache.cxf.feature.transform.XSLTInInterceptor">
    <constructor-arg index="0" value="pre-protocol"/>
    <constructor-arg index="1" value="org.apache.cxf.ws.security.wss4j.WSS4JInInterceptor"/>
    <constructor-arg index="2" value="org.apache.cxf.binding.soap.saaj.SAAJInInterceptor"/>
    <constructor-arg index="3" value="xsl/stylesheet.xsl"/>
</bean>

Since I am still getting the "unexpected element" error message, I believe that the interceptor was not called.

Which class/phase should I specify for this to work? Is there a way to configure a Logging interceptor right before and after the XSLTInInterceptor was called, to see if the transformation worked as expected?