Here's a nicer fix, same trick but with a bit more finesse. Take the rubber sleeve off the broken lever. Get an M8 allen-capped bolt. I think it's 40mm- basically, the shank has to be about 8mm longer than the rubber toepiece. Slide the rubber over the bolt, you'll find it's a near-perfect fit.
Now flat off the broken lever with a griner or hand file and drill a hole in the lever, then tap it with an M8 thread. Now simply thread the bolt into the new hole and fix it with threadlock or similiar.
It looks factory, basically, and works exactly as well as stock. It also seems to be a bit stronger, and if you do break it again, you cna simply repeat the operation further up the lever. The one I've got fitted up now's been fixed once, then shortened and fixed again, and still works perfectly and looks like it came from the shop that way. A tap and die kit can be had for roughly a third the prie of a new lever and it's a useful thing to have anyway.