Multisite Blog Redirect – Within Network

Let’s say we have a WordPress network hosted at example.com, with a user that has an established blog at example.com/somegroupassociation. We need to set up an alias at example.com/sga that redirects to example.com/somegroupassociation. If possible, it would be nice to have it so that if we go to example.com/sga/about-us, it would forward to example.com/somegroupassociation/about-us.

I’ve messed around some with .htaccess (using RedirectMatch 301) and it doesn’t seem to be working the way I’d expect it to.

Any ideas? Thanks in advance!