Trueborn son of Jaime Lannister

For the life of me I cannot find any GOOD male Oc sons of Jaime. Most are incest children with Cersei or an older/more younger son of Tywin. The search has gotten to the point I've started laying out a plot where Jaime is married to Leyla Hightower and have a son named Erwin (high inspiration of Erwin from AoT)

So anyone got any recs that could itch my back in a way.

PS. Would like recs pre-rebellion or before.