I’m not sure if anyone has done this, but I found some smaller o-rings that will fit inside the Kailh Box switches. I wanted to remove most of the bottom out, so the o-ring prevents almost all key travel after the actuation point.
If, for some reason this ruins the switches or doesn’t work as intended, I’ll update this thread once I finish modding and soldering.
The only issue I had was the Kailh sealed contact mechanism falls off occasionally, so if you press a finger down against it while pushing your o-ring into place, it prevents that.
I use two tweezers to fit the o-ring. One aligns it to the small switch post and the other presses it around the post. The shape of the box stem at the bottom means the plastic bottom of the switch presses against the o-ring where it would normally bottom out.
Overall they feel a bit like jailhouse switches. I did try modding a Novelia, but the Box Royals feel better once modded.
If you can find different o-ring durometer ratings and thicknesses, you can soften the bottom out or change the distance.
I bought these specific o-rings a long time ago, so if I can find the specifications on them, I’ll add them to the thread.
Pics below to illustrate: