Okay, after a bit of searching (I originally was considering the BeatSonic stuffs) but I found what looks like a much better option (and cheaper). The Crux AVITY-01. Has anyone used one? Why better than BeatSonic? BeatSonic has a button to override. The Crux uses your steering wheel controller to override the lockout. Much better, cleaner IMHO. Crux is about $125 - $150. Beatsonic is $250. Both does navi lockout override, phone mirror, etc.. I still have not pulled the trigger yet as I am still researching and looking for feedback. Let me you know if you have experience with Crux before. Thanks.
Thanks! I was looking and saw three different models, only one of which we suitable for the 2016 Prius. As mine is a contract vehicle I shan't be investing in mods, but thought I'd investigate the claim anyway.