ORIGINAL: retransit

If it can't be cut at the joint of the stabilizer you can measure below the stab a specific amount, say 1/2 inch, and place your cut at that point on both sides of the fuselage. When the stab is removed it will be easier to remove the remaining wood. The fuse can be repaired with another piece of wood and CA'd in place. It should be as good or better than the piece you removed.

Now you can reset the stab by sanding the replacement wood in place at the correct dimension.