Just a note on the bus shuttle, they take a 1/2 hour lunch break and don't run, it's at some odd hour like 2:30-3:00 pm. Ask someone when you get there. I fiddled around in the T3 lounge until is was too late and had to go through security in T5. I would have been much happier to have missed it.
Even on a domestic connection you are already air side and can take the shuttle.