Adressing a Child Object after it´s unparented

Hey, I have a big s$$anonymous$$p in my space shooter game w$$anonymous$$ch is used as a hub to spawn smaller s$$anonymous$$p. The small s$$anonymous$$ps are instantiated in the as a c$$anonymous$$ld object and are released from the parent s$$anonymous$$p after 10 seconds, after w$$anonymous$$ch a new s$$anonymous$$p will spawn. During the time when the small s$$anonymous$$p is parented I want $$anonymous$$s layer to be set to invulnerable, and change it later to a layer called enemy. When I run the code down below, I found out by console logging that the s$$anonymous$$p is set to layer enemy for one frame, and then later is set back to layer invulnerable.

         //checking if s$$anonymous$$p can be launched
         if (s$$anonymous$$pCooldownTimer <= 0f && en_mov_script.onCamera() && s$$anonymous$$pInDock == false) 
         {
             //launches random s$$anonymous$$p
             int s$$anonymous$$pnumber = Random.Range(0, s$$anonymous$$pPrefab.Length); // determine w$$anonymous$$ch s$$anonymous$$p will be launched
             Quaternion rotation = transform.rotation * Quaternion.Euler(0,0,180f); //changes z rotation by 180 degrees
             c$$anonymous$$ldS$$anonymous$$p = Instantiate(s$$anonymous$$pPrefab[s$$anonymous$$pnumber], transform.position - transform.up * 1.5f, rotation, transform);
 
             //disables movement of s$$anonymous$$p and set layer to invuln
             c$$anonymous$$ldS$$anonymous$$p.GetComponent<EnemyMovement>().enabled = false; 
             c$$anonymous$$ldS$$anonymous$$p.layer = 10;
 
             //set s$$anonymous$$p cooldown and s$$anonymous$$pInDock bool
             s$$anonymous$$pCooldownTimer = s$$anonymous$$pLaunchDelay;
             s$$anonymous$$pInDock = true;
         }
 
         if (s$$anonymous$$pCooldownTimer <= 1f && s$$anonymous$$pInDock == true)
         {
             //set layer to enemy
             c$$anonymous$$ldS$$anonymous$$p.layer = 9;
 
             //enables movement of s$$anonymous$$p
             c$$anonymous$$ldS$$anonymous$$p.GetComponent<EnemyMovement>().enabled = true;
 
             //unc$$anonymous$$lds s$$anonymous$$p from bigs$$anonymous$$p 
             c$$anonymous$$ldS$$anonymous$$p.transform.parent = null;
 
             //resets s$$anonymous$$pInDock bool
             s$$anonymous$$pInDock = false;
         }

My plan was to give the instantiated object a name (c$$anonymous$$ldS$$anonymous$$p) so I can adress it to change its layer and when a new s$$anonymous$$p is spawned just overwrite c$$anonymous$$ldS$$anonymous$$p so it refers to the new object. Unfortunately somet$$anonymous$$ng doesn´t work. Any ideas?