Is there a way to reset the heading of the Inertial Sensor in Pros without recalibrating it like setHeading() in VEXcode?
No but you can easily do it yourself. It really depends on what you want to use it for and how. The basic logic is storing the previous gyro value in a variable and storing the current one in another variable. Then the another variable would store this expression
current value - previous value. Now the gyro value is reset to 0 relative to the current reset.