Some additions and alternatives to your Crossover descent route.
The peak you have labeled as "Wooded Stump" is "Stumpy Hill" according to McLane.
The sketchy grassy traverse ends up at the bottom of the raps/start of the goat trail.
There's an alternative to the 200M bushwack section at the end. Here's the written description.
From the end of the scree descent below Stumpy Hill, at the bottom of the lowest rock buttress of Stumpy Hill (5,200') head East. Go through a granite boulder field with short cliffs above, then past a large flat granite slab where the slope starts to descend. Pass the slab on skiers right and pick up a brook/drainage, may be dry in late season. Follow the drainage ESE down through steep relatively open forest for about 1,000'(distance) to the top of a tree canopied rock gully(4,400'). Take this steep 4th class rock gully(possible rockfall potential) straight down to the center of the basin below the direct start of NEB of Slesse. Cross the basin and take the climbers trail back to the memorial plaque, but be aware you may be crossing the run-out zone of the bypass hanging glacier if it is still large.
As you approach the direct start of the NEB you can see this hidden rock gully from the basin. On Google Earth or Map you can see the boulder field, slab, and gully, but the rock in the gully does not show.
Looking back on the start of the Crossover descent, the route goes through the notch right above the highest snow.