Sorry to hear about your troubles. Through JIRA the only way to restore a custom field with the same ID would be to perform a full system restore to some point prior to the field being deleted. This would overwrite your entire instance with the data contained in the backup file.
You can create a new field for story points. It is just a " numeric" field type within the system. Just calling it "Story Points" won't make all of your historical reports work again. It sounds like you knew that already though.
...It's true that there are projects in Jira; but they are merely a way to cut off issues, to tell them apart from other sections of work and to apply rules that are specific to that team (the schemes)....
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