My dash first split in 1999, and I had it repaired here in Christchurch, however I was never completely satisfied, and the repair has since failed. The crack is about 2 inches long and for now I've had success at halting its advance by drilling small holes at the ends of the crack. Meanwhile I've had some fruitful correspondence with this crowd here:
http://www.dashboardrestorations.co.nz/
Over the phone they assured me that they can match the texture, and I have seen some wonderful examples of their work. Therefore my plan is to suck it up and hand over the readies to have the dash reskinned at some point.
Luke, for the cost of post you could even consider sending your dash over to Dashboard Restorations. They appear to take on a lot of overseas work.