Once upon a time, I used to know Tcl quite well. I started my career implementing and supporting DCE for a large organisation in the UK. The scripting / command language was Tcl. Readers with good memories may remember that it was also the scripting language used in early versions of WebSphere Application Server (which is no suprise since the technology originally came from a company called Transarc, which was big into DCE). It has all been replaced with Jython now, of course.
Anyway, the other day I came across a sample demonstrating how to access MQ from Tcl. It uses Java under the covers to actually make the connection, using the JMS API. Maybe the sample is of interest to somebody.