Okay guys. Call me a genius for thinking about trying this. Or call me an idiot for not trying it sooner.
After a few nights of trying to get Bepinex to work with the game i finally did it.
I installed and used Unity explorer to get access into the custom room and spawn the new character.
Explaining what to do would take too long so im going to leave a tutorial video and an archive of my game pre-modded.
For now i didnt figured out how to get the robot but maybe you guys will be faster than me. Until then Enjoy it <3
NOTE : You cant click buttons unless the unity explorer menu is disabled , to open it and close it like in the video press F7
Mega