automatically parses 3rd-party webpages (say sponsor-hosted FHG's), finds all full-sized images there, uploads them to your host, crops the thumbnails, generates a
standard WP gallery, inserts it into your post/page and also assigns a featured image (if you want it).
So, the only thing you will need to do to create a WordPress gallery from any 3rd-party HTML gallery (literally
ANY) is to simple enter the target gallery's URL into the simple dialog box right in the visual WordPress post editor (there will be a special button for that).
Anybody needs such a plugin?