Closer,

need to figure out inhand/on head icon states.

code/modules/mob/holder.dm

@@ -53,4 +53,5 @@
 /obj/item/weapon/holder/pai
 	name = "pAI"
 	desc = "It's a little robot."
-	icon_state = "pai"
+	icon_state = "pai"
+	icon_override = 'icons/mob/in-hand/paiheld.dmi'

code/modules/mob/living/silicon/pai/pai.dm

@@ -541,6 +541,7 @@
 		//pie.status_flags |= PASSEMOTES
 		held.put_in_active_hand(pie)
 		pie.icon_state = "pai-[icon_state]"
+		pie.icon_override = 'icons/mob/in-hand/paiheld.dmi'
 		return
 
 	..()

code/modules/mob/living/silicon/pai/software_modules.dm

@@ -552,13 +552,14 @@
 	name = "Host Bioscan"
 	ram_cost = 5
 	id = "bioscan"
+	toggle = 0
 
 
 	on_ui_interact(mob/living/silicon/pai/user, datum/nanoui/ui=null, force_open=1)
 
 		var/data[0]
 		var/mob/living/held = user.loc
-
+		user << "held"
 		if(istype(held, /mob/living))
 			data["holder"] = held
 			data["health"] = "[held.stat > 1 ? "dead" : "[held.health]% healthy"]"