Need to Flex with a Draft

Howdy folks,

I find I need to use the flex command rather than sheetmetal - for too many reasons to go into here, and it's not relavant to my problem - and I can't seem to find help or tutorial that teaches me the trick.  Pretend I'm making a bucket.  The flat pattern of this bucket will look like the path of a windshield wiper.  Once rolled, it will form the bucket with the draft.  Is there a way to flex this into the shape as shown?  Many thanks in advance.

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