Sure you can. Guys like Blake Perkins get DFAed every month. They’re not a commodity. Whatever he was prior to last August, he just isn’t that guy anymore. You can’t justify keeping a guy for no other reason than playing a quality CF.
And he doesn’t really “hit lefties”, his splits against them are .222/.323/.333/.656.
It just looks better than the other side because the way he hits righties is so ungodly bad that he literally doesn’t have a single hit against one in 35 plate appearances.