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Take some 30 second subs, stack 'em as a separate image.
Cut and paste it on top of the long exposure stack.
You're working in layers now.
Lower the opacity of the short sub image to 50% so you can just see it on top of the long exp. image then using the mouse and cursers move it so it's exactly aligned.
You'll need to play around with each image now, adjusting opacity, levels, curves till can see the trap but still retain most of the outer nebulosity.
Time to flatten the image. Maybe do a little more adjusting if you feel it needs it.
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