Hey, what a clever idea!
For the pronto error messages a redirect is necessary, but not for my own messages.
I already use my own function to be able to use the small screen on the 9400 like this:

function outputDebug(s) {
var lines = splitLine(s, 40);
for (var i=0; i}

I just have to change this function to send the messages using TCP instead of using System.print (and then the line splitting isn't needed anymore :-) ).