There is no client side interceptors in JBossMQ.
However, you can use any AOP framework (i.e. JBossAOP etc.) to aspectize (write an interceptor or an aspect) your class (which I assume could be JMS client).

Regards

You can use any AOP framework (i.e., AspectJ etc). What I was trying to say, there is no JBoss provided Client Container(Proxy) with a configurable interceptor stack, something you see in JBoss EJB implementation where you have concepts like "Client Side" and "Server Side" with coresponding configurations and interceptor stack.

For everything else you are correct.

Regards

If I understand your question correctly, you somewhat answered it yourself.
As far as basic java rule of thumb, if you can reuse some of the functionality, then "extend", otherwise "re-implement". However, since you are providing another interceptor your inharitance comes from adding (before, in-between or after) to already existing interceptor stack. So I would say write your own interceptor, deside where you want to stick it and that is all you have to do.

As far as making it as Jboss service is entirely up to you. In other words if you want it to be managed then yes make an MBean out of it, if not, then jaring your interceptor class and throwing it in the lib directory will do (providing you specify implementation in the server interceptor stack)