Thank you all for your help ! I think I’ll share an alpha render, the AE files and the movie version I’ve worked on (I couldn’t work on the original version, I have the Blu-Ray but no device to extract the movie from it). I might DM some people here for more advice when I’m fully satisfied with what I’ve done.
Also, I checked what Kewlfish did, I think we used the same plug-in since my version of Luke’s saber is quite consistent with his.