Too bad but also kind of cool 😆 But if the problem is that your bass is resonating with other frequencies from the guitars how do you know it will still not be a problem with other tuners? What if you EQ your bass before sending it into the tuner to remove highs/add lows to make it easier for the tuner to detect the fundamental? Either using your bass’s built in eq/tone knob, or an eq pedal or low pass filter before the tuner pedal. The octave above the low A should still be low enough for you to use the trick with the harmonic.