The solution I came up with was:
- Create a list of all the source URLs you have, and all the destination URLs you want
- Create all the destination URL pages
- 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)
- Implement 301 Redirects for the Ugly URLs
- Deploy a Sitemap with Pretty URLs
- Submit Your Sitemap to Google Webmaster Tools
- Wait for Google to re-index all your pages
- Check that the new URL(s) show up in Google search results too
- 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.