Bending it would be the best solution as Chuck suggested. But if you wanted to add something permanent, splicing on new piece of wood along the comb would be neater than using Bondo to build it up unless you are just going to use it as a jig to have a new stock cut from it. The new wood could then be formed to match your desired dimensions with a rasp/sandpaper and toned with stains to be close to your old wood. Mike Orlen has bent stocks for me fast, reasonable price and well done.