You mean, like Kha's ult and passive?
Yeah, something similar.
I wanted to add a little more counter play by preventing the stealth from taking affect immediately, so you could try to follow the champion/ place a ward down quickly to keep vision, to prevent the stealth from activating at all.
I think it would be really cool for a jungling like champion to be able to use the corners and the brush in the jungle to make them extremely powerful. All the while making them overall weaker in open terrain.
The other point of it is that the champion would need to prime the ability by entering vision of the intended target/targets. So it would not be like they couldn't/wouldn't be aware that the champion is in the area.