There is no route "kind of like the Whitney trail".
It's either the Carillon/Russell saddle, or a strong class 3 climb up from the Whitney/Russel pass, including lots of loose talus, where you need to pay attention to find the correct route.
I have gone up from W/R pass, but not the W/C saddle. I think, except for the steep drops on both sides of the W/C saddle, that route would be easier.
But both routes are far from being like any trail.