It looks like the hardware can handle it, but you will have to modify some software to make it work.
Grab the Bosch BMI160 datasheet. That’s the IMU on the Tracker SoM and in the Tracker One.
In the Tracker Edge firmware, the BMI160 library is in lib/bmi160. You’ll have to modify this library. Fortunately you can just edit it in Particle Workbench and it will use the changed version when you build your Tracker Edge firmware. It shouldn’t need a custom Device OS build.
The INT_ORIENT settings on the BMI160 are where most of the changes will be. The catch is that there are no accessors for setting these settings in the library, and in fact the register definitions are not in src/bmi160regs.h either. But you could easily copy them out of the data sheet.
The other catch is that you need to modify the registers to enable orientation but the readRegister and writeRegister are private. Thus you will need to either make them public, or put your code for setting the orientation registers in the library itself.
It’s possible that you might need to do some other things to enable and handle the interrupts. I didn’t get that far. And wake on orientation change is even more complicated and I didn’t look into that.
But that’s how I’d get started on it.