Outside application and or plugin, probably best since some time has past to jot this issue down for a later date to review and look into for next time and just go ahead and manually do it, this is a good example of why planning ahead is important. Blender might help with this idk about blender to much though & jumping…
This is sad news, Kevin was a huge inspiration. I adored his gear of war work and it was one of the first examples I’d seen of how z brush could be used on environment assets. RIP