Gutted for you man, thats a nice piece of timber too....
Options... hmmmmm.
Apart from having a very short handle, I guess you're looking at adding a second piece for the back of it. Personally, I like those wavy splices that Osmo (thetopicala) does so well. You'd need to boil it off for that though - I never worked with DI. Would boiling ruin it? If so, you could just cut around the tang and make a straight joint, but I imagine getting the mating surfaces flat will be tricky.
For me, I'd boil it off and start over. Once the DI dries out you might salvage some small scales from it.