Is it possible to get a job in a philosophy department with a non-philosophy PhD?
The key would be to offer the department something attractive. Let me give you a well known example.

Previously in philosophy there have been many workers who have studied the questions around "what is the mind?" They have asked a huge variety of questions such as:
- How do we recognize a mind in another?
- How does the mind connect to the body?
- What does it mean to be conscious?
- What happens to the mind when we sleep? Get knocked out?  

And many many MANY other questions. Whole aisles in the library of books published on such questions.

Then along comes artificial intelligence. And a new philosophical "industry" is born. You can go look at nearly any of those books and check what happens if, instead of a biological mind, you use a computer made of silicon and transistors and so on. And instead of memory and sensations it runs on software and electronics.  This can be a hugely productive research program that can, in principle, interest both the philosophy department and the computer science department.  And possibly the neuro-science types in the medicine research areas. 

There is another example. Consider the idea of evolutionary biology. This area studies how characteristics relate to genetics and evolutionary selection pressures. Then along comes Prof. Gad Saad who studies the evolution of psychology, with emphasis on why people value certain things over competing interests. Such as why people select their mates, why they prefer certain clothes, etc. And he is a prof of Marketing.

Now you enter with your degree in some other science. Is there the possibility you can relate this to some important philosophical question? In principle, you could found an entire new channel of philosophical investigation. 

Crossovers of two seemingly disparate lines of research can be massively productive. There can, of course, be some difficult times at the start. But if you can establish it, you could wind up being the wellspring of a huge amount of highly interesting research.