So, I had misplaced that key related scroll somewhere in the dungeon, as my notebooks and inventories were full, so I made a pile of items somewhere in one of the rooms that I had completed, but forgotten which. It took me about an hour to find, and then it was still difficult to understand what to do.
The problem is that even after trying all of the combinations of the switches with the first five active, we didn't really make the connection regarding elements. It would have been helpful for there to be some reference to elements regarding the switches, or if they had elemental pictograms above them or something. It is the kind of thing where I might have discovered the solution by systematically going through all of the combinations, but never understood the meaning of any of the switches. Puzzles solved by trial and error or accident are less satisfying than those requiring thought, or where I understand what I did. I still have no idea what the other switches mean. For example, I was able to enchant a dagger with one of the combinations for ice, but that combination does not work on other weapons. I thought that perhaps the elements could be used to add resistance to armors, but this does not seem to be the case. Also, it would have been nice to be able to remove enchantments on an item to repurpose it. (I did find that the everburning torch turned into a regular torch if placed into a sconce :/ ). In any case, there seem to be so many variables regarding the switches, that I doubt most people would go through the trouble of trying many combinations on each item type. Out of every puzzle we encountered in the ORRR2, we considered this the most obscure/least satisfying. In any case, while there are lots of secrets remaining and a couple of swirl key doors unopened, we were content to escape with that repaired key, and may return at a later time for further explanation. I definitely would have been disappointed if we were unable to resolve that.
Thanks for the assistance, it is appreciated.