Myself and other modders have been porting over mods using construction set on the original Oblivion release. Realizing that under the "remaster" of Oblivion lies the original game in itself, I started experimenting with installing the construction set directly into Oblivion remaster to streamline the modding pipeline. Here is how I did this.
STEP 1:
Download BSG's Oblivion construction set from The Elder Scrolls Construction Set - the Oblivion ConstructionSet Wiki
STEP 2:
Navigate to \SteamLibrary\steamapps\common\Oblivion Remastered\OblivionRemastered\Content\Dev\ObvData
STEP 3:
Move the Construction Set installer into the ObvData folder and run the installer
STEP 4:
It will tell you that you do not have Oblivion installed and then give you an option to change the directory of the installation. Direct the installation to \SteamLibrary\steamapps\common\Oblivion Remastered\OblivionRemastered\Content\Dev\ObvData
STEP 5:
Navigate to \SteamLibrary\steamapps\common\Oblivion Remastered and create a new folder. Name it Data. When you save your .esp files, save them to this newly created Data folder.
Note: Your .esp files will not appear in this folder. They will actually save to \SteamLibrary\steamapps\common\Oblivion Remastered\OblivionRemastered\Content\Dev\ObvData\Data
Don't ask me how or why this works, it just does.
STEP 6:
Run TESConstructionSet.exe - you are now able to work directly with the files from Oblivion Remastered.
Optional:
I also recommend downloading xEdit and Fix NL - Copy Name from Previous Override - xEdit Script at Oblivion Remastered Nexus - Mods and community by MadAborModding and following his instructions on fixing the [NL] prefixes that will show on your custom content.