Photoshop :: Wire Removal On A 16 Bit (Half Float) EXR File Format

This query is with regard to a Wire-removal/Touchup process in dealing with16Bit(half float) EXR files. Here is the process we adopted.
 
- Opened a 16Bit (Half float) Exr file in Photoshop, which showed it as 32Bit file

- Since the footage has lot of fire/blast elements among which we need to erase a "WIRE", we need to use "Healing Brush" which doesn't work on 32Bit files. When we tried to 'Convert' 32 Bit file to 16Bit file directly, we get a 'Washed Out' problem, since the shot is over exposed due to Fire/Blast elements in it. So here is a pipeline we used.
 
---- Added "Exposure" (Image > Adjustment > Exposure)
---- Set the "Exposure" to -5 (since it is a over-exposed frame, value -5 depends on exposure values of shots)
---- File > Export > Render Video (OpenExr output)
---- Open the above render file in photoshop
---- Convert to 16bit (Image > mode > 16bit)
---- Use any 16 bit tool for cloning (Eg. Healing tool)
---- Added "Exposure" (Image > Adjustment > Exposure)
---- Set the "Exposure" to +5 (Reversing)
---- Convert to 32bit (Image > Mode > 32Bit)
---- File > Export > Render Video (OpenExr output)
 
After rendering out, we checked the "original footage" with the "output exr" and apart from the Touch-up (wire removal) portion, all other details remain the same. Since this is a high-end hollywood project, (professionals) confirm whether this process is safe.
 
During the process we found a bug that this process only works, when we render whole footage, meaning if we try single frame, then there seems to be a slight color difference only in the overexposed area. 
 
When we opened the client input EXR file, under Nuke it shows as "16 Bit (Half float)" but the same when opened under photoshop it shows as 32 Bit file.