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That seems plausible in regard to the "found an organisation"-part of my idea.
But what about the modding-a-mod part? Again, think of it as 7 days to die using assets. If you can mod a game that is using assets legally, you should be able to mod a mod that is using assets legally.
I'd generally ask that further replies actually come from a base of knowledge, not opinon. Have you seen something in EULAs or TOSs that speaks against or for this?
You say it's plausible, but it's really not. Unity Pro licences are not cheap and on a "per person" basis. ($125/month per person, fyi)
Anyone can mod a mod that is using assets. You CANNOT then redistribute those assets if you are not the original mod author because that would be breaking the EULA.
And yes, I have seen the TOS and EULA because I bought unity store assets for my mod. SpeedTree had the worst EULA because it was way more restrictive than just the standard Unity one. The general rule is anything you buy and is tied to your account can be used in any project YOU make.
So you can edit the raw asset however you like, package it up and distribute it. In the case of 7DTD, this means getting the positioning right and then packaging it up as a UNITY3D file at the very least. If someone else then takes that and reuses it in their mod, or alters your mod and redistributes those assets, they can have the work removed via various legal means, but DMCA is usually the most common.
So there's your answer based on the EULA and TOS I have personally agreed to when purchasing assets from the Unity Store for inclusion into my mod. Anyone could take Darkness Falls and mod it for their own personal use, even if they chuck it on a server for their mates. They would not be able to modify and redistribute it with certain assets (I have a TOS for my mod with my paid-for assets listed as something folks are not allowed to use), but they could redistribute it with the free ones or JUST XML tweaks (so a patch to the base mod).
EDIT - This is from the Asset Store FAQ regarding distribution of assets. Modding is considered OK because we package up the asset rather than distributing it in raw form (just like how TFP package up their assets in a resources.asset file for distribution).
Can I Redistribute Assets That I’ve Licensed?
I have purchased/ downloaded assets and would like to distribute or resell these.
No. All asset use must be embedded components of electronic games or digital media. Physical materials are permitted when they are marketing materials relating to the project.