I’ve spent a lot of time around AK and the two most useful lines for a single hander IMO are an wulff ambush and a 40+. Both floating. I’ve never needed a sinking head and rarely if ever, needed a sink tip for stripping flies. But an ambush easily handles a light sink tip or poly leader if you feel you need it. The max tip I like on my 8wt ambush is 10’ of t8. For swinging with a spey rod, that’s different, floating skagit head and a type 3 is usually all a guy needs but be prepared for a heavier tip if need be. For longer casts and no sink tips, 40+ gets the nod, it’s a smooth line, I’m sure you’ve casted them plenty on the beach. Remember a lot of these rivers are low gradient and not very deep. If I’m not fishing wogs for coho I’m stripping lead eyed leeches on leaders 7-11’ long. There are so many aggressive fish, you will likely catch them until you are sick of it regardless of exactly what your setup is. 40+ or ambush has the guts to cast long and comfortably with a weighted bunny fly all day and won’t fold in the wind and they will toss a mouse, wog or skater great as well. I love both lines, but if I had to choose one I’d go ambush. But YMMV.
I would always have a 6/7wt rigged with a nymph taper to bobber fish a bead at all times on an Alaskan stream. All my nymph rods have airflo Kelly Galloup nymph lines and I like them a lot, if you can’t find that look at SA anadro indicator. I’ll probably be going that way myself to try one out but for now, I like how fishable and how durable the airflo is. Either way, a nymph specific taper is what you want, don’t try to bobber fish with a shooting head, you will be miserable mending that thin running line.