I still think that if you’re going to show something explicitly Hyperspace related with this weapon, it should be an effect which puts the red beam into Hyperspace. For example, the beam could be red as it exits the weapon but would turn blue and disappear as it reaches a certain distance from the weapon. I’m thinking as the beam moves past the destroyer, Kylo sees it turn blue and disappear. It might cause some distortion above Takodana if we’re using the original cut of the film, I imagine a blue distortion appearing at once from horizon to horizon as if parts of the beam are ‘leaking’ out of Hyperspace. Then it emerges fully over the Hosnian system, becoming red again.