Good success for opening these! I think this is the first on internet
Now I will have 2 suggestions for you.
One of them is really good quality cable but might be larger on diameter. Link is here:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230550874022&ssPageName=STRK:MEWAX:IT
The seller (Navships) told me that this is the softest silver coated copper cable in his store and can be suitable for iem and headphone applications. I have ordered one but my friend in USA has not shipped it to me yet. Navships is a good seller. Previously I made 2 other purchases from him and they arrived safe.
But you need to see the cable yourself to consider if it is really suitable or not... Also you will need a mini stereo jack. Neutrik jacks are popular and they are small. You can buy them for 3-5 USD from online stores.
Other options are possible for recabling. You can purchase a cheap iem and use its cable with the jack attached so you dont need to worry about buying the jack separetly and soldering it.
This iem can be a good candidate:
http://focalprice.com/EP268X/Kanen_KM92_Wooden_Inear_Headphones.html
I bought one of these from focalprice. Surprisingly KM-92's cable seems to me very durable. It is thick, does not always tangle, and it is strong. It really seems better in quality than the C710, Ai-M6 (older maun color version), EP-630 cables. But the jack is very small and the connection point seems filmsy but it is really durable. I have already tangled it two times very strongly to the obstacles while I was walking and it did not fell apart! One time the earphones fell out of my ears and the other time the jack came out of the player. So I beleive this cable and jack can last. Although microphonics are not great on these...
Its price is really cheap. Including shipping only 3.57 USD. So you will have nothing to loose
Please share your results with us