Power transformer alternative for recessed outlet

I am considering upgrading my non-smart Orbit controller to a Rachio 3, but I have noticed that the Rachio has a power transformer built into the power cord. I have a recessed outlet on the exterior of my home where my existing controller is powered (bottom plug in the picture). I am concerned that the power transformer won’t fit. What alternatives or options do I have?

Is there a transformer that will fit inside of the outdoor enclosure?

This and an electrical pigtail.

The transformer will then plug in inside the weatherproof box…

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Thank you! I didn’t see the wiring on the outdoor enclosure. This will work great.