Most likely it will be difficult to happen considering how much his father loves Man City, this is not about money, maybe Real Madrid can buy top players, but Real Madrid doesn't want to be careless about player transfers because Real Madrid is thinking about the balance of the club. If they waste money, financial problems will occur. At a club as big as Real Madrid, I think bringing in Mbappe is far more sufficient than having to bring in Haaland to satisfy Florentino Perez's ambition to chase all the titles.
I also quite agree with what you said because a team as big as Real Madrid basically already has some of the best players so it would look quite good to be able to get Mbappe to fill their squad next season. So Real Madrid can have the option of saving money by not sacrificing the team's performance next season because I am also quite sure that Real Madrid will be much better than the previous season in terms of competition and their performance unless there are many mistakes that can prevent them from performing well next season.