It will not be very difficult for Real Madrid to get Bellingham if they wish to get him. It is not always a problem for Madrid to get any player they want before they have the money and again they cannot be seen as the biggest club in Europe which every player will like to play in for prestige and fame. Bellingham himself will be happy to play on the big stage of Madrid.
Any player would be very honored to receive an offer from Real Madrid. Money is not the main factor for players to go to Real Madrid, but because it is easy to lift trophies makes it very difficult for players to refuse offers from Madrid.
As one of the big and most successful clubs in Europe, it is very easy for Real Madrid to get targeted players, not all players can be successful when they join Real Madrid because the competition in the main squad is very tight. One example experienced by Hazard, before moving to Real Madrid Hazard was an important player in the Chelsea squad, now he is only a bench warmer due to not being able to show his best performance like when he was still at Chelsea.
Obviously this is very good but whether Dortmund drama will continue here because even though they are always looking for profit by selling their young players who have above average performances but when you look at some quite long transfers like what happened to Haaland it is clearly still difficult to see if Dortmund will just let him go.
Jude is one of their potential players and when they can't keep this player certainly making several offers to be bigger is definitely Dortmund's best option.