How to use MatrixColor to create Hair Colors in Character Creator?

[Hojoo]

Hello! I'm fairly new to Ren'Py and would love help.

I'm working on a character creator for my game and have been trying to use the TintMatrix transform to recolor the sprites I'm using rather than recolor them separately. The part that I'm stuck on is how to get a tint to apply across different sprites in the same category, i.e. choosing a hair type and then a hair color.

Below are my default variables:

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default hair    =   1
default brows   =   1
default nose    =   1
default mouth   =   1

default body_color  =   1
default hair_color  =   1

$ body_tint = "#FFFFFF"
$ hair_tint = "#FFFFFF"

Below is part of a layeredimage:

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layeredimage Player:
	always:
		"images/character_creator/cc_base.png" matrixcolor TintMatrix(body_tint)
	always:
		ConditionSwitch(
			"nose==1","images/character_creator/cc_nose_1.png",
			"nose==2","images/character_creator/cc_nose_2.png") matrixcolor TintMatrix(body_tint)
	group brows:
		attribute brows_normal default:
			ConditionSwitch(
				"brows==1","images/character_creator/cc_brows_1.png",
				"brows==2","images/character_creator/cc_brows_2.png") matrixcolor TintMatrix(hair_tint)
		attribute brows_raised:
			"images/character_creator/cc_brows_raised.png" matrixcolor TintMatrix(hair_tint)
	group mouth:
		attribute mouth_normal default:
			ConditionSwitch(
				"mouth==1","images/character_creator/cc_mouth_1.png",
				"mouth==2","images/character_creator/cc_mouth_2.png") matrixcolor TintMatrix(body_tint)
		attribute mouth_smile:
			"images/character_creator/cc_mouth_smile.png" matrixcolor TintMatrix(body_tint)
	always:
		ConditionSwitch(
			"hair==1","images/character_creator/cc_hair_1.png",
			"hair==2","images/character_creator/cc_hair_2.png") matrixcolor TintMatrix(hair_tint)

Below is part of a imagemap using buttons to cycle through customization options, and trying to call a function to set tints:

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		hotspot( 90*7,  47*7,  5*7, 7*7) action [SetVariable("body_color",If(body_color==1,6, body_color-1)), Call("set_body_tint")]
		hotspot(130*7,  47*7,  5*7, 7*7) action [SetVariable("body_color",If(body_color==6,1, body_color+1)), Call("set_body_tint")]
		hotspot( 94*7,  63*7,  5*7, 7*7) action [SetVariable("brows",If(brows==1,3, brows-1)), Call("set_hair_tint")]
		hotspot(126*7,  63*7,  5*7, 7*7) action [SetVariable("brows",If(brows==3,1, brows+1)), Call("set_hair_tint")]
		hotspot( 90*7,  79*7,  5*7, 7*7) action [SetVariable("nose",If(nose==1,2, nose-1)), Call("set_body_tint")]
		hotspot(130*7,  79*7,  5*7, 7*7) action [SetVariable("nose",If(nose==2,1, nose+1)), Call("set_body_tint")]
		hotspot( 90*7,  87*7,  5*7, 7*7) action [SetVariable("mouth",If(mouth==1,3, mouth-1)), Call("set_body_tint")]
		hotspot(130*7,  87*7,  5*7, 7*7) action [SetVariable("mouth",If(mouth==3,1, mouth+1)), Call("set_body_tint")]
		hotspot( 98*7, 103*7,  5*7, 7*7) action [SetVariable("hair",If(hair==1,3, hair-1)), Call("set_hair_tint")]
		hotspot(122*7, 103*7,  5*7, 7*7) action [SetVariable("hair",If(hair==3,1, hair+1)), Call("set_hair_tint")]
		hotspot( 90*7, 104*7,  3*7, 5*7) action [SetVariable("hair_color",If(hair_color==1,2, hair_color-1)), Call("set_hair_tint")]
		hotspot( 94*7, 104*7,  3*7, 5*7) action [SetVariable("hair_color",If(hair_color==2,1, hair_color+1)), Call("set_hair_tint")]

Below are some functions to change tints:

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label set_body_tint:
	if body_color == 1:
		body_tint = "#C9823E"
	elif body_color == 2:
		body_tint = "#734C27"
	call screen chargen
label set_hair_tint:
	if hair_color == 1:
		hair_tint = "#DED6CE"
	elif hair_color == 2:
		hair_tint = "#3F75BA"
	call screen chargen

When I run the game, I get the errors that 'body_tint' and 'hair_tint' are not defined.
Is it possible to do something like this? Any help would be super appreciated, as I am very lost.