Except that isn’t what happened…
Okay it’s fair to say I’m probably off since I’ve only seen it once; without using a snippy Luke quote from TLJ, what am I wrong about here?
You said
I can’t even fathom Luke’s first option was to march to Kylo’s room, ready to strike with his ignited saber.
That only happened in kylo Ren’s version of the story.
Luke’s final version and what is generally accepted as the true version has Luke go in to read kylo Ren’s mind. After seeing kylo brens darkness he has what he describes as a very brief moment of thinking that it would be better to kill him. And without thinking ignited his lightsaber and immediately, immediately regretted that decision.