Hello Bammerman.
Thinking about the cosmetic comment, perhaps placing the magnet on the opposite side of the extension arm and paining the arm a less contrasting color would help. See the photo below.
Another way to sense the state of the lock would be to checkout the last picture of:
My Wyze Smart-ish Lock Another Approach II
The only thing seen in this application is the modified contact sensor sending unit placed against the wall.
Another approach is to install a Wyze Lock. It can be checked out at the Wyze website.
Victor Maletic.