what if we coded the things we intended to happen

code/modules/mob/living/carbon/human/health.dm

@@ -6,7 +6,7 @@
 	// This is because the logic for being unconscious from damage is, for some reason, in UI. //
 	handle_regular_UI_updates()
 
-/mob/living/carbon/human/rejuvenate(fix_missing, reset_to_slot)
+/mob/living/carbon/human/rejuvenate(fix_missing, reset_to_slot, var/delete_nif = FALSE)
 	. = ..()
 	if(!.)
 		return
@@ -16,7 +16,7 @@
 
 	// todo: this obviously doesn't respect reset_to_slot.
 	if(fix_missing || reset_to_slot)
-		species.create_organs(src)
+		species.create_organs(src, delete_nif)
 		restore_all_organs()
 		client?.prefs?.copy_to(src)
 		if(dna)

code/modules/species/species.dm

@@ -622,9 +622,14 @@ GLOBAL_LIST_INIT(species_oxygen_tank_by_gas, list(
  * called to ensure organs are consistent with our species's
  * this is a destructive operation and will erase old organs!
  */
-/datum/species/proc/create_organs(var/mob/living/carbon/human/H) //Handles creation of mob organs.
+/datum/species/proc/create_organs(var/mob/living/carbon/human/H, var/delete_nif = FALSE) //Handles creation of mob organs.
 	H.mob_size = mob_size
 
+	// if we have a NIF, unimplant it before it gets wiped
+	var/obj/item/nif/our_nif = H.nif
+	if(H.nif)
+		H.nif.unimplant(H)
+
 	// store the markings for each limb we have so we can apply them to our new limbs
 	var/list/temporary_marking_store = list()
 	for(var/limb_type in has_limbs)
@@ -669,14 +674,12 @@ GLOBAL_LIST_INIT(species_oxygen_tank_by_gas, list(
 			O.organ_tag = organ_tag
 		H.internal_organs_by_name[organ_tag] = O
 
-	if(H.nif)
-		var/type = H.nif.type
-		var/durability = H.nif.durability
-		var/list/nifsofts = H.nif.nifsofts
-		var/list/nif_savedata = H.nif.save_data.Copy()
-
-		var/obj/item/nif/nif = new type(H,durability,nif_savedata)
-		nif.nifsofts = nifsofts
+	// if we had a NIF, decide if we want to delete it, or put it back
+	if(our_nif)
+		if(delete_nif)
+			QDEL_NULL(our_nif)
+		else
+			our_nif.quick_implant(H)
 
 	if(base_color)
 		H.r_skin = hex2num(copytext(base_color,2,4))

code/modules/species/station/xenochimera.dm

@@ -691,7 +691,7 @@
 		return
 	var/mob/living/carbon/human/H = owner
 	H.restore_blood()
-	H.species.create_organs(H)
+	H.species.create_organs(H, TRUE)
 	H.restore_all_organs()
 	H.adjustBruteLoss(-healing_amount)
 	H.adjustFireLoss(-healing_amount)