We were able to get this implementation happen.
To solve this Web Methods had to import some jar files for Client JMS: com.ibm.ws.ejb.thinclient_7.0.0 + com.ibm.ws.orb_7.0.0 + com.ibm.ws.sib.client.thin.jms_7.0.0
And use a bootstrap of this type PROVIDER_URL: "iiop://natasha:2810"
Alaso these details as previously mentioned:
a factory - "jms/ConnectionFactroy" a queue name- "jms/inQueue" and an initial context - "com.ibm.websphere.naming.WsnInitialContextFactory"