Create different permalinks for same post

Question

I am working on a website where we have blogposts.

These blogposts have 2 custom taxonomies: subject and region.

The permalink of a blogpost looks like this:

/subject/blogpost-title

my normal blogpost archive is /subject which lists all blogposts from a certain subject (custom taxonomy). This is fine.

However my client also would like the following archive

/region/region-name/knowledge

this link should show all blogposts for the region. Via a custom rewrite I can show these blogposts on the archive page:

 $new['region/([^/]+)/knowledge/?$'] = 'index.php?post_type=post&_cat_regio=$matches[1]';

This works. But the permalink / breadcrumb of the blogposts is of course still: /subject/blogpost-title

So as soon as you click on subject in the breadcrumb you are out of the region area and back into the normal post archive.

Questions:

Would it be possible to rewrite the url of the post when under region to (so basically have an alternative permalink based on where you are)

/region/region-name/knowledge/blog-title

And 2: would this be a good idea? I know you can set the canonical url on the post so Google won't get confused. And I understand the need to show the latest blogpost for a region. But would there be a better solution?

Has anyone experience with a setup like this?

Any comments are highly appreciated!