Anyone have hands on experience with Shimano Metrea bar end levers?

I'm very curious about the metrea lever set. It looks like there is a distinctly sculpted right and left lever design. I was thinking of swapping the lever from the right brifter assembly into a left brake assembly. I was wondering how feasible that was (yes I want ss with hydraulics). I have pretty good fab skills.

- Is the level pinned to the assembly or screwed in?

- How long of a straight run do the handle bar tubes need to accept this assembly?

- Are H bars comfortable? (Currently riding bull horns)

- Are there any other hydraulic bar end levers I should be looking at?