1. You aren’t talking about “genetic modification” but rather a total rearrangement and redesign of its internal organs and digestive tract. At that point, it would not be a pig. It goes beyond, even from a science fiction perspective, genetic modification (cf: quotation above showing this can not be done by science but only by a Ha-Shem).
2. It would have no messorah.
3. A more reasonable question would be modification of the hoofs of camels and llamas.