Giving the KoR lightsabers is a must in my book. They should be crackly like Kylo’s, but without the crossguard, as it symbolizes him being their leader. Maybe on Exegol one of the others could have crossguard to signify he’s been replaced? Probably not, just a thought.

If he weren’t so old, I’d say to make Lor San Tekka the one surviving Jedi student who didn’t turn. It would add a layer to Kylo killing him. But like I said, he’s much too old.

I think the KoR need a presence in TFA and TLJ. It might be possible to repurpose the shot of them walking with Kylo aboard a Star Destroyer in TFA or the start of TLJ, but one would have to remove the cracks (EbSynth could handle that). That closeup of the mask definitely has to go if we do that. The KoR aren’t in the following scene (the meeting), and we already have an establishing shot of the ships, so removing it should be seamless.

As for where to put it, I think a good spot would be just before Kylo meets with Hux at the start of TLJ. Like in TRoS, they wouldn’t be present for the meeting itself. Maybe one could composite one them into the shot after the helmet smashing right before “Prepare my ship”. However, the shot after has the camera rotating, so they couldn’t feasibly be in that one.

One could insert them into that one wide shot of Kylo on Mustafar, surrounded by his fallen enemies. It’s the only shot they’d need to be in continuity-wise I think.

The idea of giving them dialog, while it might make them a tad less intimidating, would be brilliant way of giving them character. We could explicitly establish them as Luke’s former students that way.