The solution I came up with was:

1. Create a list of all the source URLs you have, and all the destination URLs you want
2. Create all the destination URL pages
3. Work out what the Ugly versions of all hashbang (pretty) URLs should be and record them (ref: https://developers.google.com/webmasters/ajax-crawling/docs/specification)
4. Implement 301 Redirects for the Ugly URLs
5. Deploy a Sitemap with Pretty URLs
6. Submit Your Sitemap to Google Webmaster Tools
7. Wait for Google to re-index all your pages
8. Check that the new URL(s) show up in Google search results too
9. Clean up – Remove the pretty URLs from the sitemap

Job done!

I created a detailed page on this with examples on my blog at www.thedriversgarage.com/web-technology/redirecting-hashbang-urls-wix-urls/

Disclaimer - Make your own enquiries and do your own tests.  I'm a pragmatist, I really don't care if this complies to standards.  It worked for me and that's all I cared about.  Google, etc. may process this stuff differently in the future. Do your own tests.