NAT before route

I have an SRX240 which is acting as a router to a third party. I also have a video encoder on IP 172.31.253.2/27.

I need to change the IP of this device before routing it to the third party:

+------------------+       +---------------+        +-------------+       +---------------------------------+
|     Encoder      +------->    SRX240     +-------->Change IP to +-------> Route to third party            |
| 172.31.253.2/27  |       |172.31.253.1/27|        |10.10.10.10  |       | 10.100.0.1/30 --> 10.100.0.2/30 |
+------------------+       +---------------+        +-------------+       +---------------------------------+

So, how do I perform a NAT before routing it out of an interface? Is this even possible?