I found a couple of downloadable saves that can help out enormously with this:
This one has everything removed from all saves including the interior layouts of the apartments in San Myshuno
https://86tigerlady86.tumblr.com/post/183186808651/my-empty-save-i-delete-all-lots-in-every-world
She even removed the permanent lot traits from the apartments using a mod which she links in her post.
This one doesn't touch San Myshuno, or any of the specialty lots, but all other worlds are blank:
https://ridgeport.tumblr.com/post/185144559967/clean-save-continued-cupidjuicecc-made-a
I get blocked sometimes trying to remake worlds with all the original builds in place, and going through and deleting everything is really boring and time consuming especially now that we have so many worlds.
One quick note, it just occurred I never checked the first save to see if the vacation worlds are empty, I assume so but can't say for sure, but she does say all and she did a complete job on the main worlds. Hope this helps some who want to remake their worlds, I hope this isn't considered derailing OPs thread. :)
ETA: All of your rebuilt worlds look awesome!
Oh 1 quick note: tigerlady86's save has everything named in what appears to be German. Just an FYI.