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One of our colleagues at the National Archives wrote an article a couple years ago on the topic of repatriation oaths and women who lost their citizenship. You can find it here: http://www.archives.gov/publications/prologue/2014/spring/citizenship.pdf
The National Archives at Ft. Worth, TX, has a database of these women from that region. You can contact them at email@example.com for more information.
Lastly, there are apparently loads of repatriation oaths on Ancestry and Family Search among the naturalization records. If you're able to get to a NARA research room, you can access Ancestry.com for free: https://www.archives.gov/research/databases/
We hope this helps! Please post a link to info about the art installation. I'd love to see it.