TBH, I don’t see why human remains can’t be disposed of the way other garbage is disposed of, through the same garbage processing facilities. Just literally take the deceased to the garbage processing center and chuck them into the shredder along with their old mattress.
When it comes to remains, I don’t consider them to be “my loved one”, that part is gone. I will honor whatever wishes they’ve had before they died, but my own wish will be that my loved ones just quickly get rid of my body at a minimal cost and move on. To remember me, just celebrate what I’ve left behind.