Even though this post is almost a year old it was very inspiring that someone @didymos was attempting to connect two BNO055 sensors to Bela. I just wanted to share my repo for 2 x BNO055 connected concurrently with Bela. Hope other people considering to connecting 2 x BNO055 to Bela will find this helpful https://github.com/L4COUR/Bela-2xBNO055.
cheers!