What causes the risk of capsizing?
If you can minimize that by developing skills, readnig water better, etc, then the need for a tether goes away altogether. Maybe it's a few strong eddylines. Learn how to cross them properly. Maybe it's downed trees or rocks -- learn how to deal with those.
If you are alone in an environment where self-rescue is difficult in 3-4 feet of water and exiting the river is near impossible, it means you must have some decent current. Even though it isn't whitewater, it's still pretty sketchy from your description. Should you be alone? Would a strainer around a blind bend be a major problem for you?
Not trying to ebat you up about being alone, but realistically it sounds like there are dangers there that could cause you some problems. How do you minimize that?
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