I am definitely sure that they are not going to loan out Osimhen, that will not be the case, they are looking to sell him without a doubt. It could be PSG, it could be Chelsea, it could be some other team but in the end the yare trying to sell him and just get the money instead.
I understand that they may want Lukaku, and I understand they may even make some profit from that exchange, like get Lukaku for free, give Osimhen and take some money as loan fee as well, all of that could still be "profitable" for them, but it will not be enough, we are talking about a player that could worth 100+ and they are going to look to get that money without a doubt. If we can't make that work somehow then we are going to have some trouble.
What I think will happen is that we are going to end up with a situation that will take a while, and for that to work in the end, we need to be careful, it is going to be very risky and it will not be too simple, we need to see that part. If Osimhen is not sold, that is causing asset that's unloaded for Napoli, they need to unload him quickly and make that money, so they can look for transfer market and see which players they can get with that money.
If Napoli hopes that there will be a club willing to sign Victor Osimhen, so Napoli must not be stubborn and should be realistic. They must be aware that Osimhen did not have an impressive enough performance last season (not like before), so practically it will make the market value go down. But if Napoli still insists on releasing Osimhen at a price from 2 seasons ago, then it could be that no club is interested in him.
I think the option of swapping Osimhen with Lukaku could be a pretty good choice because apart from getting financial income from the exchange, they will also get the players they want. Another option is to lower Osimhen's selling price, maybe that way PSG will make an offer that could become a good deal for both parties.