Yamaha TX500 - Unusable Cam Chain

Oh dear, oh dear, Oh dear. Jack made an excellent job of reassembling the clutch, then came the time to re-install the cam chain. A link had been ground in order to split the chain for disassembly. Unfortunately the ends of the adjacent links had also been ground through, meaning that the chain is effectively junk. It is a duplex chain (In order words two chains side by side!) and if it were possible to obtain one it seems as though it would be extremely expensive . A decision needs to be made on what to do with this bike/engine. If anyone has a spare Yamaha TX or XS500 cam chain in a cupboard it would be gratefully received.