A rope bracelet - reminds me of making friendship bracelets back in the day. My right second toe used to go numb because I'd hook the end of the bracelet over it, and then knot embroidery floss for HOURS.
Weaving techniques that might be helpful (not for card weaving but for weaving where the warp threads are spaced further apart. This board is very useful for details about weaving. (For stories about Peruvian children and adults weaving
Simply use the basic knot you’d use to make friendship bracelets to wrap the main cord and each of the individual earbud cords. To make them even more tangle-proof, wrap plastic coated twist ties inside with the cord.