I fought with a jet pump sollution for a few years. Although I was only drawing 10' in elevation, I was drawing over 100' overall. You can loose prime for a number of reasons and repriming the pump is always a pain specially with long draws. just a little POS in your foot valve is all it takes!
I found no passive solution to freezing. There are heater tape solutions as well as heated pipe solutions.
disregarding the freezing issue, if you create a little pump enclosure down at the water level and pump up instead of drawing up, many of the issues are diminished.
Further you could put a deep-well pump in the lake and all these issues go away completely
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