I think Indy 5 went into production long before EEAAO, and at that time, Ke Huay Quan had retired from acting, working as a stunt coordinator and second unit director.Ke Huy Quan had not been acting for a long time prior to Everything Everywhere All At Once. He did say in some interview during his awards run this year that Spielberg still sends him Christmas cards, so they were sort of tangentially in touch. However, I'm not sure if anybody really thought of bringing him back or not. I agree that I would have liked him to be there. If this film was made now, post-Everything Everywhere All At Once, he probably would have been. But I'm sure they had to have wrapped on this before that film came out and deservedly brought him back into the spotlight.
I am also going to wait for the physical release to buy this.