Quaternion Slerp 180 Away from target

I am working on a space flight simulator, at this point i'm trying to get an autopilot running to approach and stop at a defined distance to the target object.

I don't want the possibility to simply brake down the velocity to zero, in case the ship has to stop accelerating, turn arround 180 degrees by a defined turnrate and then start the engines to slow down until it reaches a velocity near zero were it can brake to zero an turn around again to face the target.

     void Update () {
     
     if(Input.GetKeyDown(_control.autoApproach) && !_approach){
         if(_target.selectedTarget != null){
             _target.approachingTarget = _target.selectedTarget;
             _distance = Vector3.Distance(_target.approachingTarget.transform.position, _myTransform.position);
             _way = _distance - _maxDistance;
             
             _approach = true;
         }
         else
             _approach = false;
     }
     if(Input.GetKeyDown(_control.stopAutopilot)){
         _approach = false;
         _MoObj.DefEngineOutput = 0;
     }
     
     if(_approach){            //if approach
         if(!_braking)
             RotateToTarget();    //turn to face target
         Vector3 directionToTarget = _myTransform.position - _myTargetTransform.position;
         float _angle = Vector3.Angle(_myTransform.forward, directionToTarget);
         if (_angle > 179 && _angle < 181){
             MoveToTarget();        //approach till < 2000
         }
         if(_rotateToBrake){
             RotateToBrake();    //Turn around 180°
         }                        
         if(_braking){            //Increase Output to slow Ship down
             _distance = Vector3.Distance(_target.approachingTarget.transform.position, _myTransform.position);                    //CheckDistance
         }    
                                 
                                 //Decrease Output to decrease Speed before arriving at TargetVector
                                 //Arrive at TargetVector by Brake();
                                 //Rotate to View Target
     }
 }

     private void RotateToTarget(){
     if(_target.approachingTarget != null){
         _myTargetTransform = _target.approachingTarget.transform;
         _myTransform.rotation = Quaternion.Slerp(_myTransform.rotation, Quaternion.LookRotation(_myTargetTransform.position - _myTransform.position), _MoObj.TurnRate * Time.deltaTime);
     }
     else{
         _target.approachingTarget = _target.selectedTarget;
         RotateToTarget();
     }
 }

     private void RotateToBrake(){
     
         
     if(_target.approachingTarget != null){

         _myTargetTransform = _target.approachingTarget.transform;
         _myTransform.rotation = Quaternion.Slerp(_myTransform.rotation, Quaternion.Inverse(_myTransform.rotation), _MoObj.TurnRate * Time.deltaTime);
         //_myTransform.Rotate(Vector3.down, _MoObj.TurnRate);     
         
         
         
         
     }
     else{
         Debug.Log("No Target for AutoPilot!");
     }
 }

My actual problem lies in the RotateToBrake() function. I don't get it and its late now. I checked nearly ever type of rotate function Unity comes up with, i tried a 100 times to print out myTransforms.rotation, viewports, rigidbody rotations i tried euler angles, Quaternions, defined angles, simple Transform.Rotate to AddForce Variants. I tried to set a new Gameobject directly behind my ship to use turnto again but somehow i made it wrong. Maybe some1 has an idea how to get the exact direction behind my ship and turn it there in a smooth way like a Quaternion.Slerp();

Or even a completly different Idea how to solve the hole thing...

Greetings Mahtrok