Action to copy text in () to Artist field

I'm looking for an action that will take any text inside parenthesis and add it to the artitst field after the artist text.

So this:

turns to the this:

Thanks!

Copy the whole of the TITLE into a user-defined field
Format value for tmp_title
Format string: %title%

Strip the stuff that is not in parenthesis:
Guess value for tmp_title
Guessing pattern: %dummy% (%tmp_title%)

Add the stripped field to ARTIST:
Format value for ARTIST
Format string: %artist% (%tmp_title%)

Remove the field tmp_field: Delete field tmp_field

Thank you much! Works great!