If it is agreed value insurance it should not matter. Your agreeing on a value for the whole package not itemizing individual add ons. This is one of the reasons for agreed value, so they don't have to play the, "it has this kind of paint", " it has fuzzy dice and side pipes", "it has special wheels". It is all blanketed under agreed value, no going back to add in your "extras" when it gets totalled.
I have not found insurance which covers you in any competition type setting. That would most likely be on a per use basis with a lot of mumble-jumble to help protect them from big liability situations.