Alright, I came up with a more brilliant idea than my previous one. Here's the example for science yield: 1) Rework rationalism to "+1 science per campus specialist. +2 science per campus district (this counts as an adjacency bonus)."; 2) Add national wonder "National college". It's effect is "+5 science to this city. Friendly cities within 4 tiles from this wonder generate +100% science from their raw population (+1.4 spt instead of +0.7). Once powered, these bonuses double. Available with Education. Can only be build once in every empire. Captured national wonders only keep their flat yield bonus (+5 science in this case)". 3) Remove city-state bonuses to science for libraries and universities. Similar applies to culture.