If that ever happened, the Saudis would build a brand new state of the art stadium either in the centre of the city or in the south of the city, they would build around it, everything geared up to create a positive image of themselves.
You'd see a 40 thousand state of the art complex, with everything surrounding it (bars, restaurants, shops etc) all geared up for top flight football, they would then move the training complex.
The Saudis are all about engineering an impression of themselves through construction and success, their long term goal has always been to secure their future by diversifying their streams of income.
The western European model Is heavily based on tax and individual control, the insane lengths to try and get everything electric and create this ideology that electric is better than fossil { you need fossil to power the electric charging stations} is just another form of control, the Saudis won't have any skin in the game long term, hence these mega projects, the purchasing of football clubs, the heavy fan focused investment in boxing.
These Saudis would 100 percent change the landscape of our Football club, that's a fact. The on field investment, the Stadium would be in an area far more accessible for everyone traveling in, the youth academy would be improved as would the first team training complex.
The 3rd kit would piss you off, and they would eventually want to change our club emblem, and for that the Saudis can suck my weiner.