I grouped my HUD elements as children of a canvas layer node, which itself is a child of my main player and it works! Cheers
Pseudo Hierarchy:
Root
⠀|
⠀|---Player
⠀⠀⠀⠀⠀|
⠀⠀⠀⠀⠀|----- PlayerSprite2D
⠀⠀⠀⠀⠀|⠀⠀⠀⠀⠀|
⠀⠀⠀⠀⠀|⠀⠀⠀⠀⠀|------ WeaponSprite2D
⠀⠀⠀⠀⠀|
⠀⠀⠀⠀⠀|----- Camera2D
⠀⠀⠀⠀⠀|
⠀⠀⠀⠀⠀|----- HUDCanvasLayer
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀|
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀|----- HealthSprite2D
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀|
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀|----- WeaponSelectionSprite2D
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀|
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀|----- InventorySprite2D