Assigning Item Target ID to Variable

じ☆ve冰风

I'd like to have an item work differently based on who the target is, and I cannot find the proper way to set the variable.
The item calls a common event, which uses filler text until I get this sorted;

@>Conditional Branch: Variable [0015:ItemTargetID] == 1
   @>Text: -, -, Normal, Bottom
    :     : Target ID was 1
   @>
:  Else
   @>Conditional Branch: Variable [0015:ItemTargetID] == 2
    @>Text: -, -, Normal, Bottom
    :    : Target ID was 2
    @>
  :   Branch End
@>
: Branch End
@>

What I need is a way to assign the ID of the item's target to variable 15, outside of combat. The closest to an answer that I've found is:

$gameVariables.setValue(0015, a.id)

However, due to being out of combat, a.id crashes the game. All references to checking an item's target that I've found are for MV, so I don't think I can pluck much relevant code for this case. I've also concluded that the item's damage formula can't be used, again due to being outside of combat.

More information that may help explain my goal;
I intend to set the variable just before the first conditional branch.
Text will be replaced with boosting the stats of a specific party member when used, otherwise nothing will happen. (I can work this part out myself)
The scope of the item is One Ally, useable only from the Menu. It is not a key item, and is consumed upon use. (I'm unsure if those affect anything, but it may be worth mentioning)


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