It's too early to tell what the crowd patterns would be like so probably ask again shortly before your visit. I suspect that most people would go to Frozen first so theoretically, if you are at the gates when they open or at rope drop, getting there before the crowd could be a way to go. But since HKDL will be selling early entry, on days with a lot of foreign tourists or if you don't arrive right at opening, starting in Tomorrowland will probably be a safer option.
The problem with starting in Adventureland is that Jungle Cruise requires enough people before they start a boat so unless you're doing a Cantonese boat, you could be waiting for quite a while at rope drop. Additionally, Grizzly Gulch, Mystic Point and Toy Story Land can open as late as noon on off-peak days which means once you're done with Jungle Cruise, you're far from other rides.