Another one?
Yes, I managed to fix everything that was wrong with the last one, don't worry!
As you can see, this is in easy reach of all donors, and only accessible to those with the passcode. How does a donor get the passcode? They're simply invited in by another donor that has it. The code is also on a brick inside.
The red button you see blows up the room, so it's not boss proof. Neutral Zero helped me with this.