If your plan is to hunt in Washington and getting your boat access from Canada, I would bet that you would run into trouble (but I could be wrong) with Canadian and US border patrol.
I’d recommend if you want to use a boat for access, having a canoe and portage from Diablo to Ross or rent a boat from the resort.
https://www.rosslakeresort.com/equipment-rentals
According to that website looks like The Hozomeen boat launch has been closed since 2020, and recommend checking with the Canadian Border Patrol for accessibility updates.
NPS says "Until further notice, the gate at Hozomeen will remain closed; vehicle and foot traffic across the US/Canada border is prohibited. Visitors must enter through a designated port of entry. For backcountry permit questions email noca_wilderness@nps.gov. (2/13/25)"
About 15 years ago me and my family hired a water taxi from the resort to take us to Lightning Creek CG so we could camp for several days. It was a good base camp for several days of exploring. Taxi came back 4 days later and picked us up. No phone service at the time so it kinda felt like a crap shoot but the guy showed up.