I have a macbook 5,2 and sleep works well however trackpad is unfixable, I use a mouse
I have it too. Sleep works perfect (almost in 10.14.0).
I fix trackpad buying one of an older macbook pro. Is a multitouch trackpad with same dimensions so you can change it.
The only thing that doesn’t works is the webcam but i don’t use it so for me the computer is fully ussable.