[lch]

As I explained in the Spell Guide Beta-0 thread, your current line of thought unfortunately leads nowhere. So here's a more fruitful thing that you could do, simulating the same as the Eyes of God global:

1. Copy the spell "Astral Window" into something that requires no gems and is pretty much impossible to cast (H8S10B10 or something like that), via spell modding.
2. Add a totally inaccessible province with lots of H8S10B10 casters, as many as there are other provinces in the game, via map modding. Set them to monthly cast. Have them target all the provinces that are on the map.

Alternatively, use regular Commanders and give them all Stone Spheres via map modding. A bit of a problem is that Stone Spheres have a slight chance of giving horror marks, which will increase hosting times a bit (horror marking checks, horror attack checks) and might make you lose one of your scrying commanders to a horror over time.

That's probably the closest you'll get with modding only, for a Watcher nation that doesn't take up a global slot.