I wasn't talking about fixing the template, I was talking about fixing the neck. The only saw I have is a jigsaw, so I can't make a straight enough cut to get a laminate in there, and I don't have a planer to clean anything up anyway.
The template piece is trash, but the damage is on a straight edge, so I should be able to fix this one neck by working around the damaged area and then sanding flat afterwards on the belt sander.
After I have the neck shape cleaned up, I'll clean up the damaged part of the neck and glue in a patch the best I can. If there's a visible defect it will be beneath the fretboard where it will only be seen by looking from above while playing.