You might want to check your draft on the Trent.
I believe that route is mostly reserved for power boats with minimal draft.
I could be wrong, but I would make some phone calls on that.
But as far as your question, "Fastest Route", from where your starting, that has to be it.
Its a long way down Huron and across Erie.
EDIT: This might be a helpful tool to have on board, at 12 bucks it would be fun to have anyway.
Trent-Severn Waterway Guide