Accent lighting in the bathroom

I need your attention and a lot of brainpower from you! We had a wall outlet installed for accent lighting in the bathroom, connected to a light switch. The plan was to build a drywall track in the slope, continuing the cladding (top left in turquoise), so it aligns with it. Behind that, then a cheap light strip, so that light shines down over the entire area. The area is 210cm long. We hesitate to implement this because of the roof pitch and the patching... it will probably turn out crooked and uneven with us :p Do you have any other ideas? Maybe there are ready-made lamps? I currently have a 25% Paulmann voucher through Sovondus, but it can also expire if I find something creative and inexpensive or stylish and inexpensive at the bookstore or elsewhere.

An LED light cove ? possibly across the entire width ?

What please? Yes, gladly across the entire width :)

To my knowledge, there are also such stucco strips for LED lighting. Maybe they can be installed with less warping and crookedness.

This is indirect lighting using, for example, a [Stuckleiste], but there are dozens of variations. Best to just google it.

An LED light cove? Possibly across the entire width?

Is that the correct word or a typo?