Although I don't recommend it, you can do what you want using bulk edit search & replace in RegExp mode. The source is template, the destination is title. All without the quotes: source match will be "^(.*)$". Replace will be "\1". The template would be something like "{title} {series:| [|}{series_index:02d|]|}".
I can't test it at the moment. Perhaps someone else can.
PLEASE PLEASE make a backup of your library before trying this. You can easily destroy your library and there is no undo. No one here can help you fix it.
This will take a long time to run because calibre will change the name of most files in your library
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