For anyone interested, this mod exists. Not sure how updated it is right now. I will try to see if the unlocked debug items transfers through library without the mod installed, so as to render the mod redundant in the final save the lot is placed; as that would be ideal. I'll update in a while.
"City Living Apartment Problems For Any Lot" by Laura Ray Amos, on Postcards from Sierra Nova:
https://postcardsfromsierranova.blogspot.com/2014/12/city-living-apartment-problems-for-any.html
I found it through this trail, and the info is good to read, but these two mods are not updated:
"Unlocked Lot Traits", by Dorsal Axe on MTS:
https://modthesims.info/d/588254/unlocked-lot-traits.html
Unlocked debug items for the lot traits, that generate the actual effects: "Moveable/Buyable City Living Apartment Objects" by NikNak513 on MTS:
https://modthesims.info/download.php?t=588505
Sorry in advance if linking isn't allowed.
EDIT: I did a quick test in a new folder of the TLC mod (mentioned first). Made a room on Potters Splay, Willow Creek, placed down all the objects from debug and waited. After a couple of sim days I saw a mouse, that gave the sim the corresponding moodlet. Did not wait for all the other objects to give effect.
Saved the room to library and placed it on Bargain Bend - all the debug objects were gone.
Copied the tray files into yet another new folder, the debug objects were gone.