I finally finished marking in class essays and am now back into thesis work.
Due to COVID-19 I've been advised to not get participants to test my instrument. And I just got my first participant to sign the consent forms the day before the university closed (on friday the 13th of course!) :(
I asked the polulu forums about changing the time of flight address. Their response is it can be done and to read a specific section of a confusing datasheet. But they warned that since the TCS34725 cannot change its address, there could be issues. Since it's confusing to begin with, and has a risk of not working after all, and I don't know how long it will take for the I2C multiplexer to arrive in the mail, I decided to not use the time of flight sensor for the prototype. I still may add it in the next upgrade though.
If you are looking for a summary for my Masters thesis, it is here.