It's getting difficult pretty quickly. I'm not quite sure how Dumbledore's portkey would work in that scenario, wasn't it designed to get Snape away from Voldemort, not to him?
Can't wait for Harry to wake up. It's not quite the same without him.
Author's response
I based the portkey scenario when Mr. Weasley and company went to the Quidditch World Cup (GoF). Mr. Weasley mentioned portkeys were created from simple items not of interest to muggles in case they accidentally picked it up. I figured portkey will transport anyone who touch it. Harry will be awake on the next chapters.