Motor Bike Broken Crank Case Fix

The black rectangle at 4 Oclock is screwed to two aluminium posts that were cast as part of the crank case housing.  Snapped off

Here you can see the D shaped break where the stud came away from the housing

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1
Welding is possible it would seem but I think will require us to dismantle the engine.
 2
Could drill a hole and screw from inside the crank case into the stud.  This will also require pulling the thing apart and we really dont have time for that.
3
Glue?

Devcon F  $100"

jb weld
http://www.jaycar.com.au/productView.asp?ID=NA1518