Unable to use call mediator in APIM 2.0.0 - wso2

Question

I've tried this on 1.10.0 and 2.0.0
On 1.10.0, you can disable the JMS sender in repository/conf/axis2/axis2_blocking_client.xml and use the call mediator in blocking mode. This is described in this blog post: http://shenavid.blogspot.nl/2016/08/invoking-external-endpoints-using-call.html and works ok. However this method does not work in 2.0.0 even though the related issue is marked as resolved.
Has anyone else tested this on 2.0.0 already? Or found an other workaround?
<?xml version="1.0" encoding="UTF-8"?>
<sequence name="opal_auth_and_send"
onError="gov:apimgt/customsequences/fault/json_fault.xml"
trace="enable" xmlns="http://ws.apache.org/ns/synapse">
<property description="ORG_PAYLOAD" expression="$body/child::node()"
name="ORG_PAYLOAD" scope="default" type="STRING"/>
<property description="URL_POSTFIX"
expression="get-property('axis2', 'REST_URL_POSTFIX')"
name="URL_POSTFIX" scope="default" type="STRING"/>
<property action="remove" description="Remove REST_URL_POSTFIX"
name="REST_URL_POSTFIX" scope="axis2"/>
<property action="remove" description="Remove transport headers"
name="TRANSPORT_HEADERS" scope="axis2"/>
<header name="Authorization" scope="transport" value="Basic xxxxxxxx"/>
<property description="set messageType" name="messageType"
scope="transport" type="STRING" value="application/json"/>
<call blocking="true" description="Get Auth token (blocking)">
<endpoint>
<http method="get" trace="enable" uri-template="https://opal-demo34.ortec-finance.com/auth/api/token"/>
</endpoint>
</call>
<property description="Get Token from Response"
expression="json-eval($.token)" name="TOKEN" scope="default" type="STRING"/>
<property action="remove" description="Remove transport headers"
name="TRANSPORT_HEADERS" scope="axis2"/>
<log description="Log auth result" level="full"/>
<property description="Restore REST_URL_POSTFIX"
expression="get-property('URL_POSTFIX')" name="REST_URL_POSTFIX"
scope="axis2" type="STRING"/>
<payloadFactory description="Restore Payload" media-type="json">
<format>$1</format>
<args>
<arg evaluator="xml" expression="get-property('ORG_PAYLOAD')"/>
</args>
</payloadFactory>
<header expression="get-property('TOKEN')" name="Authorization" scope="transport"/>
</sequence>
Thanks,
Danny