I've seen stand alone Air AMT tweeters at AliEpress. There are 2 different versions. Both versions in external enclosures, with binding post connections and level controls. So, simple enough to try.
https://www.aliexpress.com/item/High-power-ribbon-tweeter-planar-transducer-transformer-AMT-for-diy-audio-monitor-speaker/32809442695.html?spm=2114.10010108.1000013.1.27153ed1l5xzmW&traffic_analysisId=recommend_2088_1_90158_iswistore&scm=1007.13339.90158.0&pvid=331590c3-522d-4793-96e7-0506f4fcba55&tpp=1
https://www.aliexpress.com/item/Hi-sensitivity-high-power-Air-motion-tweeter-transducer-transformer-AMT-ribbon-tweeter-speaker/32811819743.html?spm=2114.search0104.3.280.721a44dblZxVse&ws_ab_test=searchweb0_0,searchweb201602_4_10152_10065_10151_10344_10068_5722918_10130_10324_10342_5722818_10547_10325_10343_10546_10340_10548_10341_10698_5722618_10545_10696_10084_10083_10618_10307_5722718_5711215_10059_308_100031_10103_5722518_10624_10623_10622_5711315_10621_10620,searchweb201603_2,ppcSwitch_5&algo_expid=b37d269b-8baf-4bbf-86e7-c73c3d85ba7f-25&algo_pvid=b37d269b-8baf-4bbf-86e7-c73c3d85ba7f&priceBeautifyAB=0
https://www.aliexpress.com/item/High-power-ribbon-tweeter-planar-transducer-transformer-AMT-for-diy-audio-monitor-speaker/32809442695.html?spm=2114.10010108.1000013.1.27153ed1l5xzmW&traffic_analysisId=recommend_2088_1_90158_iswistore&scm=1007.13339.90158.0&pvid=331590c3-522d-4793-96e7-0506f4fcba55&tpp=1
https://www.aliexpress.com/item/Hi-sensitivity-high-power-Air-motion-tweeter-transducer-transformer-AMT-ribbon-tweeter-speaker/32811819743.html?spm=2114.search0104.3.280.721a44dblZxVse&ws_ab_test=searchweb0_0,searchweb201602_4_10152_10065_10151_10344_10068_5722918_10130_10324_10342_5722818_10547_10325_10343_10546_10340_10548_10341_10698_5722618_10545_10696_10084_10083_10618_10307_5722718_5711215_10059_308_100031_10103_5722518_10624_10623_10622_5711315_10621_10620,searchweb201603_2,ppcSwitch_5&algo_expid=b37d269b-8baf-4bbf-86e7-c73c3d85ba7f-25&algo_pvid=b37d269b-8baf-4bbf-86e7-c73c3d85ba7f&priceBeautifyAB=0