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Not exactly Markus.
You don't need a second over exposed image. We use 16 bit SER files for capturing which have a lot of bit depth for each pixel and the moons are just buried low down in the original correctly exposed image. We use GIMP but Photoshop will do. So just make a duplicate layer of the original stacked and sharpened image. On the top layer add an alpha channel and change the exposure level until the moons are visible, you don't need to go overboard here, its just until the moons are visible. It often doesn't take much to bring them out. Then place a feathered mask around the moons (this is the step that we did incorrectly on the first version) allowing for any bloat from the over exposing. Invert the mask and delete the selection. And there is your image.
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