To fix the saber workbench issue, a crystal UTI needs to be added to the mod. The resref for this is the "template" referred to in upcrystals.2da. Additionally, the longmdlvar therein needs to point to the hilt UTI, which is j_juhsaber01 in this case. For future users, @Stormie97 will need to rectify this with an update to the mod.
Fortunately, thanks to a handy tool by @VarsityPuppet, it's possible to fix this for anyone that has already installed the mod (at least for those on Windows). Grab the ZIP below and extract it somewhere. Copy the upcrystals.2da file from your Override folder, paste it into the extracted PATCHER folder. Run the BAT file and follow the prompts and it will patch your 2DA with the corrected values. Copy and paste upcrystals.2da back into your Override folder. Also make sure you grab the UTI and TGA from the FOR OVERRIDE folder and paste those into your Override as well.
Stormie97_Juhani_Saber_Patch.zip