Anyway to use multiple SiteMaps depending on audience?

[JonathanHerschel]

I am currently trying to find a way to use more than 2 web.sitemap files to show the navigational hierarchy on our site.
Is there a way to programatically point to different sitemaps depending on audience of site?

if (admin) {
use/point to admin.sitemap file
} elsif (visitors) {
use/point to visitors.sitemap file
} else {
use/point to other.sitemap file
}

I know the navigation providor can be extracted from sql database, and I figured out how to create a web part to delete/ add nodes to top per audience, but I would love to find out how I can create/use an interface that points to serveral .sitemap files.

Any help would be much appreciated.
-Herschel