If he is never called Skywalker in the prequels Luke’s dad could have died back at the temple for all we know so that aspect is not really a problem.
Then we’d be wandering in ANH about Vader’s children called Luke and Leia, which ObiWan took in Episode 3, only to curiously have the protagonist of ANH be called Luke.
Unless, the babies are not seen receiving a name in ROTS, but we would still have the doubt about Anakin “the chosen one”'s children and why would they suddenly dissapear.
Unless there is no pregnancy subplot at all, but then we would wander why does Anakin fall to the darkside.
There is no way to preserve the moment in ESB without loosing more than what’s necessary in the PT. And then, even if you manage to preserve it, it’s only to the awe of people living inside a thermos, without any contact with the last 35 years of pop culture.