https://www.curseforge.com/minecraft/mc-mods/universal-enchants-forge/files/3962009

https://www.curseforge.com/minecraft/mc-mods/survivalplus-lightsabers/files/3871594
Mod version information

All lightsabers cannot be enchanted

Tested and works when setting the option allow_mod_item_support in the config to true. The config can be found in the world save under serverconfig and is called universalenchants-server.toml.