Fan Casting Fancasting the Fantastic Four in the MCU

It is set in the 1960s and a group of four people go into what we know as the quantum realm but what they call the negative zone and gain powers. Then in the upcoming Ant-Man and the Wasp: Quantumania Scott and Hope find them and bring them out of the quantum realm. Since time moves differently in the quantum realm to them it only felt like 65 hours rather than 65 years. For this story I would have doctor doom as the main villain because he will be important in secret wars.