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Banging my head against a sky replacement with very soft focus
Hi guys, having a dilly of a time here.
Per the attached, I need to key out the light blue BG and replace it with a dark green one.
The soft edge is giving me the issues, can’t seem to blend them into the BG without retaining the unwanted lighter halo.

After creating a rough mask, I have tried:
-Colorama and similar to create a luma track matte
-Keylight to key out the blue
-Luma Key
-Colorama and superimposing a light wrap to bring the dark green in around the edges.In looking at the example, what would you suggest? I know i am probably missing something very obvious so thank you for your patience and understanding in advance.
Cheers,
Chris