Although Lukaku is not suitable for the long term. But getting Lukaku after selling Osimhen could indeed be quite an effective move. Because there is no need to question Lukaku's quality in Serie A. He has experience at Inter Milan and at Roma and the results are always good. He has always been the player who contributed the most to his team in Serie A. And this is different from Lukaku at Chelsea, who was not as good as when he was in Serie A. So Chelsea really wanted to let him go and even continued to loan him to other teams because Lukaku was not suitable for the EPL. .
Napoli are currently still trying to release Osimhen and Conte understands the situation so he does not comment much on this issue because he understands that there is an agreement that has been made between Osimhen and the club which means that Osimhen will be released in the current transfer window if there is a club who are interested.
It does seem like Lukaku is more into this style of play in Serie A, it has been proven that he can perform better when defending a Serie A team than an English League team for example. So when he goes to another Serie A team, he won't have much difficulty adapting, in this case Napoli. However, I don't yet know the extent of the closeness or process that Napoli has carried out to bring in Lukaku, because they also have to pay a high price to Chelsea, who is still the team that owns Lukaku.
The situation is complicated for Napoli and Osimhen, because what I know is that they are currently having difficulty finding a team that is willing to pay the price they want. Even though recently there have been rumors that they are willing to negotiate and sell Osimhen below the price they want, there is no team that is really serious about it at the moment.