if you want to clean up your Player's node tree, you can make each CollisionPolygon2D an instance/scene, organize them in a specific folder and even add a script to attach individual properties to it.
Then you load and unload them dynamically in your player scene.
In my case, I created several different CollisionShapes for my vehicle, each attached with their own script that contains different property values.
body00.tscn w/ script:
var speed = 100
body01.tscn w/ script:
var speed = 150
Then on my players scene, in it's script, I dynamically load which vehicle body I need, and load their individual properties (such as speed), since they all use the same movement code.
player.tscn w/ script:
array = ["res://body00.tscn", "res://body01.tscn", etc...]
var pck = load(array[id])
var body = pck.instance()
speed = body.speed
Something like that.