You can use the attempts described in Louis's post [here](http://android.stackexchange.com/questions/62414/hotword-detection-of-google-now-search-not-woking), but they have limited success.

As of now, there is no way to change the Touchless Control hotword to anything you want, but as per the "hack" you requested, using [AutoVoice][1] with [Tasker][2] would be the way to go. You can set up AutoVoice to listen continuously for any hotword you want, then use that hotword through tasker to trigger Google Now. A tutorial for the setup can be found [here][3] that also uses [AutoShare][4].

Be aware that this workaround won't give voice responses, as it essentially records your voice and uses the input to do a text search. If I find a more usable example, I'll share it here, but this may be as good as can be done without root.




[1]:https://play.google.com/store/apps/details?id=com.joaomgcd.autovoice&hl=en
[2]:https://play.google.com/store/apps/details?id=net.dinglisch.android.taskerm
[3]:http://www.pocketables.com/2013/05/how-to-use-google-now-from-autovoice-using-autoshare-and-tasker.html
[4]:https://play.google.com/store/apps/details?id=com.joaomgcd.autoshare&hl=en