Get those yoyo’s they sell for Hydro lights...if you go to Amazon pull up LED for plants and scroll down to “See what customers bought after viewing” .... you’ll see whats call “light hangers” ...
Practical but Not sure if they are aesthetic enough for you application
In a previous build I used a black curtain rod & insluated wiring. I ended up using 4 hooks in the ceiling to improve aesthetics & stability on either end. It was cheap & it worked.