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May be someone who is on the forum tool rental program can help.
Otherwise I'd go and find some plywood off cuts and cut a step of the required depth into it with a router - or do it the old way with a chisel - and then shape the flange with a hammer. This method works best for a part off of the car!
If you need to flange "on the car" then make two plywood hammer forms with a step in them and then use a step on either side of the sheet metal with a G-clamp to start the shape you need.
You'll have trouble getting crisp straight shapes in mild steel thicker than 1mm though...
...crisper shapes will happen with a harder (steel) former - like the dies of a flanger...
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