Hello. I know about NRaas Sleep Freedom, but that's not exactly what I am looking for. I want mod that will not need to replace beds, will work with downloaded beds and most importantly, will not mess my game once removed. Is there such a mod?

Afraid not. NRaas SleepFreedom doesn't work the way it does just to be annoying. The block on young sims sleeping in the same bed as non-blood related others is hard-coded into the game and approaching it from the angle of particular bed models was really the only way to arrange things. It was actually the first NRaas mod I ever installed and what brought me to the site in the first place so many years ago.

And then everything just went downhill from there.