Need to have a plain text jms message when using pub.jms:send to Websphere MQ

I am using the a jms adapter and jms:send to send a message to IBM WebSphere MQ on another server.
The message format that is sent by WebMethods is in the MQHRF2 format.
That format has information in it in addition to the message text itself, including both a binary section and XML.

The IBM WebSphere MQ server will not support that format and requires the use of the simpler MQSTR format.
The MQSTR format only supplies the message text.

Can any one provide configuration or usage information that would allow me to send the message in the appropriate format from jms:send?
or alternatively can you provide information on a way to accomplish the same task described.

Thanks in advance