Hello @minieigi
you are correct, the standard Wire pins are configured correctly for port A, but in your case you don't want the I2C_Class wrapper from M5Unified. So the idea is to release/end Wire as it has been initialized in M5.begin() and then restart Wire by calling Wire.begin(13, 15).
And yes, I think the release() is done automatically when Wire is re-initialize.
Note: I don't have this particular sensor so I cannot fully test this myself.
Thanks
Felix