Well, in my case nothing was actually "lost". The chainsaw dust was used as an additive for our compost and the offcuts were chopped to firewood. Not getting the saw cut straight was the biggest issue and even that might have been easier with a harder or drier log. As I said, the poplar has very long fibres! There's plenty of videos about cutting planks with a chainsaw, even freehand, so that shouldn't have been that difficult!
But you can use a hand saw, freehand with a guiding line - either drawn or a slat nailed on the side - works just fine! Just look at this guy: