Drawing a line in a sprite

Hello. I wan't to have a crosshair, that has moving elements. It is a circle which has 2 lines growing from the center to the border bases on a float value between [0,1].

The circle is a sprite and currently the 2 lines are drawn with line renderers.

My biggest question is: Is there a better way to do this in Unity?

Also this system was working fine while the sprite was simply put in my 3d world, but now I want to move it to the new Canvas system. There if I use Screen Space - Camere, only the Sprite is rendered but not the lines.