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.
There are still many possibilities, but I agree if PSG have to lower transfer fee that man because the price now is not very possible for Real Madrid to sign him. Although Real Madrid has a lot of money, but the previous Bellingham transfer fee may have burden their finances. Actually, if another club brave to recruit Mbappe at current prices then PSG will be ready to let him go, if that happens Real Madrid will wait again to sign that man.