What does it mean:
Anything close to my
Promotion Overhaul or sort of quick fixes?
Do you mean gifting

for

? I ask because of my City-State Leaders compatibility.
Just curious, how much improvement can be seen on slow computers. I haven't played a game for a really long time, now waiting for some updates of modmods, and I'm curious. Late game performance lags were really annoying then.
If your simplification is out, and you say UI/EUI changes will be much easier, then maybe finally you will take into account incorporating some must have visual mods like:
Improved City-View
Religion Spread
Show XP in Military Overview
Filters in Trade view
Unit Path Viewer
Small Resource Icons (with very important feature for Natural Wonders' icons which stay after discovering!)
Also I can recommend this one we've made some time ago (file).
Also something like
Full Top Panel Condensed would be nice feature chooseable in options.