The outlet from Fontanilis cascades down a pluton, then through forest and into Upper Velma. It is a nice Class 2 stroll down the pluton and then Class 1 through the forest until you reach the trail by Upper Velma. One of the easiest XC sections I can think of.
Decades ago there used to be a maintained trail from Lake Genevieve almost due west to the PCT (via part of General Creek Trail). The trail is long abandoned, though there is still a wood trail marker at Genevieve. The trail is pretty much indiscernible now, and offers a nice XC experience.
Both of these are parts of this Deso Loop Combos I have marked on
this map.
Wandering Daisy, it seems like I remember a TR you did starting at a lake in west Deso going XC east a considerable distance up, over, and even perhaps along a ridge, before descending into Rockbound Valley? Could you possibly pull that up and give a link? I think it was you, but there's a small chance it was Tahoe Jeff or VaccaRuss.