No problem, and I'm not arguing against knock sensors in-general, but presenting a reality check. We have been in the same situation with fuels like many others, and the easy answer is to test it real-world. Fuel-up and drive it. Using the traditional detection methods such as electronic ears and spark plug reading, see if you have any signs of det at all, before you stick yourself out in the race with no recourse.
Relying on a knock sensor to tell you you're screwed after it's too late to do anything about it... sucks. Detecting det before the sensor can hear it is much more satisfying.
As a general approach -- if you are working with det-limited fuel, you should be cautiously working-up on the tune while testing for det constantly using multiple methods, so you know your limitations. For example, I typically plan to use 3 to 4 sets of spark plugs before it's fully tuned, because I use them as disposable or recyclable sensors.
You should always avoid being in uncharted territory. This way you create the best tune and maximum performance without random retard or excessive fuel, and also know when and how you'll see det, and exactly how you will de-tune to effectively counter it. Det becomes a part of life for you like diabetes, and just part of pre-race prep. Have fun!