It is all hypothetical – I don’t think the King George will go to Aintree because of the low sun issue.
However, if it was moved to Aintree, running it as the last race on the card would be a risk. What would happen if there was a delay due to an incident in a previous race?
Running the main race of the day as the last race on the card probably wouldn’t be favoured by the police or by Merseyrail either, with almost everyone leaving at the same time.