That would be a major issue.
The only other connection would be from
Bellingham ,Washington.Not a big problem but it would add extra
cost to the trip.It's 3 nights from Bellingham to Haines.
There are 2 ship choices the Kennicott twice a month on Saturdays,
with a ship transfer in Juneau.
Or the Columbia every Friday. Or at least that was the schedule.
From your area to Bellingham to pick up a ferry would be less driving
then to drive to Pr Rupert.
I don't know what has gotten in the minds of the Alaskan legislature.
They don't want to support the system IMO.
The Pr.Rupert stop was always a good way to start/finish a trip north.
We have taken the BC ferry Northern Expedition from Port Hardy as a different way to head north
to Pr.Rupert then transfer to the Alaskan ferry.
It will be interesting to hear what is the answer to your question.
Frank