At that latitude it’s only going to be ice free a few weeks so timing will be everything. When I was stationed in Labrador the Canadians resupplied the villages by ship during that window so finding out when they sail may help however there are roads up there so maybe not.
Are you flying or driving? If you are doing more than a few dives you’ll probably need to bring your own compressor.
Looking forward to some interesting dive reports :)