I hike that area a couple of times a year, usually heading in from jerky or the Lewis camp TH. follow them to the little kern, then over to trout meadows, then on to the kern at kern flats. From there it's possible to follow the kern downstream to forks of the kern and then use a combination of road walking and trails to connect back to jerkey.
Might also be able to do a loop from jerkey to trout meadows to round meadow to grey meadow back to the lewis trail and then back to jerkey.
Trails should be in good shape all, or most of the way to kern flat. After that, it's hit or miss.
If you were feeling adventurous, you could go down to kern flat, cross the kern and continue on to soda flat and the Jordan hot springs.
This part of the Golden Trout Wilderness is a popular area with horse packers, very few hikers though. Outside of the main trails, the area doesn't get much use or trail upkeep, so bring a good map and study it well. The endless networks of fire roads and dirt FS roads can get confusing at times. And Harrison's map of the area isn't always current but it's generally good enough.
It's a neat area with some cool old CA cowboy culture and history. Good friends have an inholding around there.