In reply to Robin UK:
I doubt those heel welts would survive very long with a heel clip crampon.
perhaps it is better to get a cheap set of something like a monte rosa crampon. After all do you really want to have all the extra weight of a G14?
and by the time you've bought the extra bits and bobs to adapt your g14s you're not far off buying a different set of crampons off ebay that will work reliably.