Try using support pack MA01. This provides a program called "Q" and you can do something like:
q -mQMGR -iINPUTQ -oOUTPUTQ -P5
This will move all the messages from INPUTQ onto OUTPUTQ and give them a priority of 5.
You will get an error 2033 reported, but that's when it's exhausted the queue.
There are far too many options to mention for this. If you want an individual message, you can specify options to get by message ID, correlation ID etc. etc.
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