I took the original snoot and rebuilt it in Fusion 360 so I could add a lense and a hole for a cord. I decided to go with a bottle like screw cap to integrate the lense.
I had to guess the measurements from the stl but got lucky and it fit right away. Yet I don't know how to enlarge the thread in the lid without changing the metric thread size. You just have to print the lid with 103% in X- and Y-direction.