The only thing I can see possibly working after that pick stage (I agree with powerpos that you had no advantage after the pick stage- he had intel on your main combo and you just had intel on Antarctica- the least useful kind of intel in this situation- and WR) is going for the FTB in Norway the way you did but also using that 4 down in Australia (maybe deploying 1 army) and countering Antarctica. Then, during Turn 5, you could've deployed (almost?) everything down south, taken out his Antarctica bonus (his only source of income) and temporarily given up on Scandinavia without blockading it or letting him take the whole bonus (just don't burn armies on a pointless defense). Now you have an income advantage and the ability to expand within Australia as well as the ability to cripple him up north. At which point you've got a somewhat "safe" Australia while he's got a safe Mexico but not many places to expand into after that. I think it would still depend on who won the battle in the north.
I don't know. His 123 makes misinformation a problem. If he goes for Greenland, then Scand could reach him before he finishes. If he breaks into Scand there could be no one there, or worse, someone in West Russia. Double pick Africa + West Russia is a bit weird for HHH, lots of room for him to misplay that by killing neutrals searching for his opponent. Like Timi said, Australia can be played much better.
HHH picked so he could get 1/2/5. If he gets 1/2/5, he wins. If he gets 1/3/4 with no one in WR he wins. If he gets 1/2/6, he wins. If he gets 1/3/6, things are weird, but he should still win. He does not necessarily win in 1/2/3, 1/2/4, 1/3/5, 1/4/5, 2/3/4, 2/3/5, 2/3/6.