First of all, parrant is valid but function “Add static mesh component” (or any other component) is not.
Secondly, I don’t wont use blueprint here to much, because I would need to add components once at a 0.01 second or less, and blueprint cant do this. Blueprints do function once at least at one frame, and one frame lasts 0.017-0.033 s (60fps-30fps).