he will adjust once you are waking him earlier if he needs it. if he is sleeping great, i would not try to move his sleep time dramatically. 7:30 is a one or two hour difference, which is pretty big. if he is cranky in the morning, start out trying bed just 30 mins earlier first to see if it helps. he may end up taking longer naps to make up for it, and also, since he is not with you, the naps schedule you have now may end up changed by his caregiver. i would prepare for a transition time and just watch his behavior and adjust to his cues.
babies adjust all the time, when the time changes in the fall and spring, they adjust. just give him time and try not to do too much change at once since he will be adjusting to his new day as well.
i would just try to have everything prepared. maybe a caregiver can dress him for the day instead of doing so much in the morning when he first wakes. just do anything to make the morning smoother for you both. good luck.