Here's the whole script creating this mod: The mod won't work with mods that modify the map (like CK2+), but it's easy to make similar version for other mods. Portages themselves don't have such restriction, anybody can navigate them just fine. Suez Canal is implemented as portage, which seems like it would be accessible to only religions which can navigate major rivers (Norse and Reformed Norse), but it turns out that's only true for portages between great rivers. If you don't like Steam Workshop for any reason, just use Steam Workshop Downloader. Now that I refactored the supermod a bit, I can release parts of it as standalone mods, so here it is on Steam Workshop. I've been playing with it for a while (see here and here), but Suez Canal was embedded in my personal supermod blob.
