You could wrap a rope around the length of the body on the sides, and use wedges to tighten it to pull the neck in. I use the 'rubber rope'; a long strip cut from a truck inner tube, or you can use surgical tubing. I use the same stuff for putting on binding. Dry clamp everything so you're sure you've gotten it right, and even practice a couple of times so that you can do it quickly. If you're using hot hide glue you can pre-warm all of the parts (but not too hot!) which will extend your working time.
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