RV Clock Mount Adapter

My Winnebago Itasca RV came with a factory installed Howard Miller brand analog clock above the door as shown in the third pic. To replace the battery the clock is removed by rotating the clock 45 degrees counterclockwise and then pulling it from the wall. The wall mount stays screwed to the valance over the RV door. See pic 2.

I wanted to replace it with a SkyScan atomic clock that provides me with more info and doesn't require resetting the time twice per year (DST). I did not want to drill