Look for TIG's Split Donut in the Sketchucation Plugin Store. It would draw in the needed miter lines. I don't know of a faster way to split the parts out, though. Having them as components you drag in as needed is probably the best way.
As for using your cutlist to get prices, you could do that pretty easily in Excel or another spreadsheet program. Since the cutlist always has the same format, you could have a sort of template file you put the CSV file into.
