The SC2 cannot take 16bit RAW images. You would need to combine the images yourself manually. Depending on your level of usage, you may want to get a camera capable of producing the HDRi images internally.
To take the bracket shots, use the RICOH THETA mobile app.
Use something like Lumniance HDR to merge the individual files into a single HDRi file.
Picturenaut is also used by some people.
Example using GIMP
Another example with video.
The video is 6 years old, but covers the workflow which was used in 2018. with the bracket shot, it is still feasible. If you don’t need the light for too many scenes, it would be usable and save you money.
