Like any surgical procedure, a gastrojejunostomy could result in infection or another complication. A gastrojejunostomy connects the stomach to the jejunum, bypassing the duodenum, the beginning of the intestine at the bottom of this image.
One more thing: Don't make your turtle's water temperature too warm. For most adult aquatic turtle species, 78 F. (25.5 C.) is the highest you want unless you're treating them for an illness and a veterinarian has told you to raise the temperature. Otherwise, too-warm water can encourage bacteria growth in the tank. It also discourages turtles from basking sometimes.
You can use either a chick egg incubator or a reptile egg incubator for this purpose. Heat the eggs slightly cooler at 68 degrees and all of the eggs will hatch as female turtles. Set the temperature slightly warmer at 73 to 75 degrees and the baby turtles will end up as male. At the middle temperatures you get both male and female turtles.