Extravagant Interiors is a cool mod and I've been using the Blue Palace version for years.  However, with Blue Palace Terrace, JK's Blue Palace, and various combos out there, it can quickly become a real mess of conflicts especially when you start patching for lighting mods as well.

So I thought - we have the technology.  Here you'll find a simple Extravagant Blue Palace.esp replacer and accompanying SWAP file to extravagant-ify whatever Blue Palace setup you might have going on.  Additional meshes are included to support Blue Palace Terrace and JK's Blue Palace.  I've collected the various modifications made across the versions and patches of the mod and created some simple patch esps to handle the edits made by Titansbane, Repzik, and Czasior to the column placements.

An optional SWAP file is additionally provided to change the dome to the Extravagant version.  The patch for Snazzy Furniture and Clutter Overhaul available on its patch page will work the same whether this SWAP exists or not, so it's only necessary to uncheck it if you have some other mod that provides a fancy dome you want to keep.

Requirements:
Extravagant Interiors - Blue Palace version + Extravagant Interiors 4K - Blue Palace Version
or
Blue Palace Terrace - Extravagant Blue Palace Standalone

Provisionally compatible with Solitude Interiors Meshes Fixes - SIMF - ExInt Blue Palace Only optional file, but several of that mod's meshes aren't based on the 4K version, so you'll see some inconsistencies on pillars and with trim lining up.
The provided meshes are slight tweaks to Extravagant Interiors 4K or included for completeness for the BPT and JK patches.

Credits:
Grumbledook - Extravagant Interiors
Plangkye - Extravagant Interiors 4K
Titansbane - Extravagant Blue Palace esp update and edits
Czasior - JK's Blue Palace and JK's Blue Palace Terrace patches, creating the FOMOD, general support on this mod
powerofthree for Base Object Swapper