I’m not sure where the Uber drop off is but I would consider being dropped off at the Hard Rock Hotel because you can walk very quickly to Universal theme parks . Just enter lobby , go down stairs and follow the walking path. They take your temp as you enter and give one of those wristbands that you keep on to exit hotel, walk , and return later. Might as well have Uber pick you back up at HR for your return to WDW. (You are taking risk with Orlando traffic for your plans With a babysitter, etc. ) What happens if late with the babysitter?