Even though Real Madrid have already got Joselu, he was only on loan for one season from Espanyol and next year requires Real Madrid to hunt for another striker if this summer they don't get a striker. Mbappe and Osimhen are the right choices but until now there has been no clear offer for these two players.
Tchouameni and Courtois seem to have attracted interest from some of Europe's top clubs and it is unlikely that Real Madrid will ever let go of the player despite being paid such a hefty sum. We know Real Madrid is not a team with bad finances and they can still sign a player like Bellingham this summer.
Since Mbappe refused to extend his contract with PSG and since the club president Al Khalifi said it clearly that Mbappe has to renew the contract or leave the club in two weeks then I assume Mbappe will join Real Madrid by the end of the transfer window. At worst he will be sanctioned and will be in the benches the next season so he might accept to leave in the winter transfer window.
Real Madrid has to find a temporary solution only concerning that spot.
If I'm not mistaken, this is almost approaching the two-week deadline given by PSG to Mbappe to determine his future and means that these will be very important seconds for his future to last for the next season. Is it possible that this time Mbappe will really move to Real Madrid or in the end he will stay with the exception as you say with a sanction or even that which will certainly cost him his time playing football. I think even if there is a solution PSG have to lower Mbappe's fee and if they don't want to do that then Real Madrid will come according to plan to sign Mbappe as a free agent, I think these two options are still strong enough to put pressure on PSG.