Are there any light tuners that would work in a Lightsworn deck?

D. D. Sprite
Effect Veiler
Demon Roar God/"Fabled" - Raven
Polar Star Beast - Gullfaxi/"Guldfaxe of the Nordic Beasts"
Vairon/"Vylon" Prism
Vairon/"Vylon" Sphere
Vairon/"Vylon" Stella
Vairon/"Vylon" Tetra

Most others either aren't that good or are more themed (specific names, Types, etc).

Lightlords don't really require Synchros as it is though.

If anything I think people use Plaguespreader Zombie in lightsworn though it's not a light.

Probably trying to stick with the LIGHT theme overall.

I think Effect Veiler is your best bet in a Lightsworn deck.