Are there any current production great speakers using AMT tweeters?

Philharmonic Audio super BMR monitors 

https://philharmonicaudio.com/products/super-bmr-monitor

The heil engineer passed away about a year ago he was also big into ham radios as he will be missed. I took a 1/4 inch threaded rod and put 8 heil tweeters on it. They rest on a nice platform screwed in with big fender washers on the bottom for support. These crossover at 800 hz. So I put a high pass filter on it. Rols makes one through parts express. Also marchand audio has a digital crossover as well as sublime acoustics mini dsp ect.  Even though these are old technology they are currently produced. They are not as pretty but you can put some wood on the sides and doll it up. I know you don't want diy so look at legacy audio or call tekton and ask him to put an amt type speaker in. Best of luck and enjoy the hunt.

Legacy !

Legacy Audio.Beautiful cabinets in real wood too!

No mention of a fine brand from Germany: Fischer & Fischer. Their entire line includes Mundorf AMT tweeters and they are unique speakers made from slate. A local buddy owns a pair of the SN 470M's and I've heard them several times. With NAT Audio mono tube amps, a Lampi Pacific DAC and a Lumin U2 streamer the sound he gets is arresting to me. Stunning imaging and soundstage. I want that too. I plan to upgrade to those same speakers. F&F offer bookshelves for your consideration within your price range. Good luck on your search.