I don't have, will never have and have never had any experience with a serger so I don't know if my suggestion is logical. Viewing from the outside as one who does not know anything about them, I am wondering if the thread path would accomodate 'crochet' yarn? If it would, could you thread each path with a different bright color of yarn and photo the thread paths for future reference. ?????????? If the yarn wouldn't work would there be any value in taking a photo of the thread paths when it is threaded with serger thread? Maybe each path in different colors.
If this is just a dumb idea ignore me as one who has no idea.