Landscaper here... 40+ years. Sounds like you are trying to make a material do more than what it is designed to do. But with that in mind, you can purchase or make a wood miter box to hold the product and saw at the angle you want. Then a slow speed sawzall. Probably will go through a few blades. Try coarse and fine to see what works best. Just search wood miter box on Amazon.
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It's all downhill from here!
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