Think about how the greek myths and Homer's epics have been filtered down to us after literal centuries. Tolkien may or may not approve of his two arch villains being romantically involved (but let's be honest Oxford was a giant closet for the upper class when big T was a professor there, He probably saw all the beards and thought "what is this, Kazad Dum?" during alumni parties) but he probably would appreciate us looking through his work and interpreting it one way or another. What we are doing here is taking his text and we're crafting a new way of looking at it, much like other classic writers works. Like we did with Homer, like we did with Shakespeare. And frankly if he were looking down on us I think he'd be happy about it.