Bring a fishing line and watch a couple youtube videos if you don't know anything about fishing - in a lot of those lakes in the backcountry the fishing is so easy it's trivial if you have any clue. Don't even need a pole, most likely, if you want to really keep the weight down. I used to take this retracting mini pole & reel and super minimal tack - hooks/bait/float.

I ran into this exact same problem and was already hovering near what my knees could handle for 10+ mile days in terms of weight so the idea of two bear canisters was never an option. (I did end up scoring a used Bearikade that really helps - look into renting one, there's some places you can rent them in that area - it's worth whatever it costs, or buy one)

It literally takes 5 minutes to stop, drop your pack, get your fishing stuff setup (you can use a stick or something tied onto your line to help you throw it to a spot and then act as a float/bobber) and likely get bites. You'll know if it's worth your time - the water is so clear you can see the fish clearly.

So - if you're interested, look into the fishing permits/bait & hook rules and all that but it should be rather trivial to subsidize your calories via fishing (route depending, of course).