Reassigning HDR color space when lost

Hello,

Does anyone know if there is guidance or technical doc out there on how to successfully reapply Photoshop's HDR color space when the HDR file is taken to another program with no color management workflow? For context, I typically use TIFs in this use case scenario for astrophotography programs that are lagging behind in color management. 

I'm working with TIFs with HDR Rec 2020 color space in 16-bit, with maximum compitatbility checked, the exif color space is rec2020.icc (linear rec2020 if 32-bit HDR color space used). However, what the best way to resave in the HDR color space and to resave as a HDR file? Any insight would be appreciated.

My current thesis is that one has to change the file handling on photoshop to open all tiffs, then open the file, then export with a HDR color space and save a new file to accomplish this goal.