Yes, lots of people have bushwhacked in and out of there. How do you think the first exploration and ascents were done?
If going in via the Franklin, be prepared for really scary creek crossings or really really scary moraine crawls, or go up the Klinaklini until able to climb onto the shoulder of Lomoll and into the Confederation Gl system.
If going in by the Homathko, some of the bridges have apparently (as of 2014) now been pulled. If so, good luck crossing some of the side creeks.
Don Serl's Waddington guide has all the info you need. Buy it.