Replicating the base game shader into the Editor

Comparison Before and After:

The way to accomplish this is very simple.
First, download and use this UnityPackage, it contains the base-game replica shader by Scoops from the mod LethalSponge and also their CustomPass that we will use.

Now, in any scene of your liking, create a new gameObject at the root of the scene, name it whatever, but the following is absolutely necessary.
Give it the EditorOnly tag, which would be the 4th tag in the tags list.
Now add the component CustomPass, press the + sign and find the SpongeNewCustomPass option and click that.
From there, make sure your settings match mine here:

Note that this won't replicate base-game 100% but it is much much better than the default (and it isn't super noticeable difference anyway).
Thanks again to Scoops for the help and guidance in settings this up (plus the fact that this is using their shader and script lol).