My suggestion is to find someone who makes or repairs rosaries and asking if they would like it. If they can't repair it, perhaps they can re-use the beads and crucifix.
My girlfriend is a jeweler and fixes my rosaries all the time. She jokes that they break because I pray so hard. Actually, they break because they're cheap - but hold very special meaning to me. I tell her there will be a special place in heaven for her due to the sheer number of times she's had to fix my broken rosaries.