Yes, the printed inserts are clean and nice looking. But it appears that two holes are needed: a shallow flange hole and a smaller and deeper body hole. It appears that to get the best results a drilling guide should be used, otherwise and an out-of-square hole will not allow the flanged top to seat flush with the surface. An out-of-square body hole on a thin door presents potential damage to the door from splintering or daylighting its surface. A moderately out-of-square hole wouldn’t matter if it was located at the top of the door where it would be out of sight.
Although the slot method I showed required three specific shifts (values are shown in the picture) of the drilling template, it only requires one size drill bit and a rather small one at that. It is more fault-tolerant to out-of-square drilling. Minimal material is removed to make the receiving slot. Retrieving the sending unit only requires sticking a piece of tape to it.
As for the magnet, drill a hole just large enough and deep enough to push it in, if the case is removed the hole can be smaller.
Some day I may get a 3D printer to make unique and useful things.