How to create a custom foam forming tool?

Hi all,

I have an application where I need to create a tool to aid in forming some foam.

Before forming, my foam looks something like this:

I need to take the thin part that is sticking up and roll it over to the opposite side, looking like this when it is done:

Ideally, I want to create a rectangular block with some type of swept/lofted/whatever face cut into it that performs this folding.

My problem is, I have no idea how to go about creating this feature.

I have tried using loft but haven't been able to create the smooth transition that I am looking for.

Can anyone out there provide some suggestions on how to attack this problem?

Thanks,

Steve