Thank you! Very helpful.I think you'll be hard pressed to do the first 3 items in under an hour before IOA opens, even if doing Gringotts with EP. The first 2 will eat up most of that first hour - physically getting through the gates, walking up to DA, then say 5-10 minutes in the Queue, plus doing the attraction itself. Followed by a bit of a wait (albeit small) to get into Ollivanders for the "show", plus the show itself of the wand choosing the Wizard..... It'll leave you probably little to no time to actually explore DA and do spells.
I'd recommend the first two bullets, then line up for HE to get over to IOA for FJ (you probably don't want to walk all the way back to USF entrance, and then go through IOA main entrance only to walk way up to Hogsmeade). Then after that you can do some exploring in Hogsmeade and doing the spells there, followed by a few of the headliners in IOA (like Spiderman, Hulk, and Kong) then head back to HE to go back to Diagon for some exploration and spells there plus Gringotts again etc.