Thanks, that is excellent! Looks like this is actually possible. More food for thought.
I have to look over your pictures and video again. I am a bit confused why this needs 2-sided machining and a 150 degree bit. The concept I was thinking about only needs one-sided machining, however to achieve a single 15-degree beveled cut I was thinking of a fixture to hold the board at this angle and then still use an endmill.
In the meantime I worked out some interferences and the concept looks like the following pics (fully visible and blind dovetails).