What other bichirs could be mixed with an ornate, endli and lapradei that won't be outgrown and eaten?
Every bichir can be mixed which each other. As long as they are kept well fed you shouldn't have any problems. However if you were to be timid of size differences then almost any of the lower jaws would be good as they reach large sizes like the ones you've listed.
No I'm no beblondie and most likely never will be. She was a true MFK legend and one to be remembered