I’m not 100% sure of your question, BY, let alone the answer! This line seems fairly straightforward to me (though wrapped in Percy’s vile syntax, which is like straining porridge through an old sock) – it surely can be rendered as
“If I were a dead leaf [the West Wind] could carry….”

Is there something more complicated going on that I have not caught?

http://www.galegroup.com/free_resources/poets/poems/odewest.htm

Edit: Surely objectification would accurately describe attributing the state of inanimate material to a living human?