How to make Varus viable

I've been thinking on how to make Varus viable in the current meta, and I have two changes that I would propose to make it work. First, Varus's number one weakness is his immobility, I would say that his current e (hail of arrows) should be scrapped and a new e that is a grapple should be added. This grapple would be able to stick to champions, walls, turrets, ect. It would have a double activation, the first being the skill shot and the second being a dash to the target. If the skill shot lands but the second part is not activated it will act as a tether with a max length until activated or it times out. The tether will not cc the target but only form the tether.

The second change I propose is add an ap ratio to Piercing Arrow, which would make trinity force a powerful buy on Varus, and solidifying his ADC caster position. These changes would turn Varus into a mixed damage caster ADC with a usable escape and initiate, making his early game (which was strong before) better with the escape and his mid game vary viable. He will still tail off in the late game making him still balanced.