Still a long shot but FLIR ResearchIR 4 has a selectable pixel type for the Amber Radiance 1!! (It even has selection for Amber 4128 which was their LN2 Dewar unit, as well as Phoenix cameras)
In Theory that means If I convert the 12-bit RS-422 Amber HVSB port to CameraLink, Then Camera Link to GigE it may be possible to connect to ResearchIR 4?
Would be a huge breakthrough if that is remotely possible haha.