Dying Phaeton – could the air suspension be replaced by a classic ?

Good evening, For 12 years I have been driving a Phaethon (12/2004, 260,000km), on which I very much hang. As the air suspension seems to be completely over now, I wanted to know if it might be possible, in your opinion, to replace it with a traditional suspension. A well-known repairer did this once successfully with a Range Rover. The following happened: After problems had occurred during the air suspension, my independent workshop tried the car. repair with used parts (such as sensors or suspension). Unfortunately, it has become worse within a short time, so that the car is now extremely high and wobbly when driving. According to the Swiss Volkswagen dealer AMAG, there is now probably a combination of mechanical problems (various defective parts in the wheel suspension) and probably also an electronic/electric problem, which makes the air pumps work badly. A repair w I thank you in advance for all the advice. With best regards, Frank D.