Hello uMOD, as the title says.

I am currently running a Community Vanilla Server. (Its a new solo/duo/trio) one.
And I'd like to noclip thru bases in order to check that there are not more than 3 ppl sleeping in the same base.
Now the Plugin Vanish would come in handy, so I can clip through without players defenses going off, killing them.
Also I find normal chat quite plain, and I'd like to use BetterChat.

Would these two put me to modded? or would it still count as a Community Server? Thanks!

betterchat is allowed and so are the admins plugins u mention
You are not allowed anything that changes vanilla gameplay and admin plugins do not count as this.

BetterChat is definitely not allowed, it changes the appearance of the game.

BetterChat is not really an admin plugin or whitelisted plugin. You will have to use ShittyChat like the rest of vanilla

you are allowed to use Betterchat 
But if you are unsure go ask alistair on Rust Discord.