I like this idea as well. We need to consider how this all plays with the vBSEO Sitemap Generator as well.
Unfortunately, I am not an expert on CRRs, but I think we can get there with a little time and help from our friends at vBSEO.
I think the overall requirement should be to rewrite all "/link.html?hl=flag" links to "flag/link.html" and to also make sure the "flag/link.html" links in the sitemaps, as well as the original "/link.html?hl=flag" work.
Also, I have been using distinct Google Sitemap for each flag and it works much better than combining all the flags in one huge, unmanageable process.
See attached update, as a FYI. (Note, in my image below, I changed es to sp (directory) ... the directory for the sitemaps only, because I had another es directory... you can use any method you like, but I like to have all lang sitemaps in a single directory for each lang.... much easier to manage!)
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