sorry no tutorials except mentioned, no guides, no examples code. Implementing message interceptor is not so hard - maybe you can try to do it in your favourite language. Simple two TCP connections to DCERouter and that's it.
I always go with language that is easy to experiment and implement something unknown, then when you figure out mechanism, then you can code it in some faster compler (C, C++)... Basically you would want to register message interceptor for messages you decide to intercept and then simply send texts to LCD device.
Misterhouse example is doing this (although I don't know if it works) and it's in Perl...