My thought on how he would act to a force-sensitive child is based on how he acts to his NJO students and Leia’s kids. He has a huge devotion and protectiveness of them, because the Jedi at this point, are the galaxy’s universally-hated punching bags. If he isn't there for them, no one is. This is why I think the force sensitive would require the most compassion. However, he also has the trait of enjoying a challenge- so if the non-force sensitive does have self-esteem issues or view himself as inferior, he'd definitely be over-compensating for that (I wonder how he would cheer a non-force son/daughter up? Maybe teach them his piloting/mechanic/blaster skills since there is a lot more to Luke than just the force) However my pessimistic opinion is that if Luke's on any level aware that removing the no-attachment rule is seriously rolling the dice- I can see why he would worry about the safety of people close to him. For example, his mother wasn't force sensitive and could not defend herself. That could be a reason why he would prefer marrying a skilled force-user like Mara Jade, to be kept "in line" and he would do the same for her in return. Turning to the dark side is kind of a horrible thing to have a contingency plan for though.