Accessing Raw IMU Data from Instinct 2 Solar

I need raw IMU data (accelerometer, gyroscope, magnetometer) from my Instinct 2 Solar for a research project I am working on.

I understand standard FIT files don't include raw sensor data, and the Connect IQ SDK has limited sensor access for this model.

Has anyone found a way to access this data, or can you (Garmin) confirm these limitations?

Alternative approaches welcome.