You can save the cloth part as a morph target, and you can save the character pose in the pose libraries  (I would do that to be on the safe side)
After that, you will need to delete all the keyframes preceeding the result that you want, so that the entire animation stands still in the frame you want. After that you can delete all frames byt the first one.

In case something gets goofed up in the process, you still have the pose saved and the final cloth sim frame saved as a morph target.

I'm not sure if there's any other way. Maybe someone else knows more :)

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