xxxHome: After doing some research, I was able to figure out how to edit the "data.sav" file through a thread on Steam Community.
Using DSLevantine's save file as the reference base, I edited in the full Endings Table as well as all other aspects needed to make this a 100% save file for Fight'N Rage! It took a ton of work, but was well worth the effort.
I don't have a way to share this 100% save file here, since this website doesn't allow new users to post any links... But if anyone has a cloud drive (and promises to continue sharing this save file's URL with the community), then I'm more than happy to upload the file onto it.
good for you. I have stopped playing for some time and my current progress is 51/56 endings