Beware nostalgia, as it can lead to worse sound and listening experiences. I do not recommend pursuit of vintage gear. I know you are seeking a current model; I'm just adding my perspective. The relevancy is that the older drivers are often surpassed by newer technology or models.
AMT has gone mainstream with many companies using smaller variants. Frankly, the AMT is now perhaps as popular as the dome tweeter. However, in my room under direct comparison I have not found them to universally outperform well-designed speakers with other forms of tweeters.
You may still be able to get the ESS Heil driver and use it in the PureAudioProject Trio 15. I haven't checked on it for a while, but that was an option. You would have to source the driver yourself, I believe. If you are adamant about that particular driver, it's a possibility, but I'm not sure if they still support it. Whether that would holistically outperform a variant of PAP speaker like the 10" Coaxial version I reviewed for Dagogo.com - that is another question! If you are curious about that option, talk to PureAudioProject about it.

