I've seen a number of repaired buttstocks where the butt had been clipped and a buttpad installed. In every one I could see where the wood was added back in the repair. Some easily seen, while others were very hard to see. But the point is I could see all of them.
For me this type of repair would always bug me, but if the cost was not too high I'd still do so if the repair wasn't easily detected. But I'm guessing those who could do so will likely charge a real premium for that level of craftsmanship.
