Bilge is here too, as seayalatermoonglow. Excellent resource for those waters.
Three weeks is really pushing it - and doesn't allow for much in the way of weather window wait time....
We haven't done that trip yet, but have done the "up the outside" to Barkley Sound and back in July; beautifully rugged but long legs, high chance of fog and I really wouldn't want to do that trip without radar, esp with limited time.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"