After taking a look at #Ecuador's boundary data from #OpenStreetMap, I found a few missing bits. I also see that my previous hack to fix a coastline had corrupted my local metadata.
I loaded up #JOSM to fix the missing province names on some cantons. I thought I might have to wait for all the map data of Ecuador to download, but no! JOSM has a hidden expert mode that enables Overpass queries like "admin_level=6 in Ecuador", so I was able get just the data I wanted!
https://josm.openstreetmap.de/wiki/Help/Action/Download#DownloadfromOverpassAPI