OK, did some more research...
In addition to what Holger has suggested (are any of the trails below a duplicate of yours?), here some trails I'm considering (in order of difficulty (hardest first). They are all located in the Charles Wells Guide to N. Cal.

Swansea-Cerro Gordo Rd.:


Pg 161, 33mi, 5-6hrs, moderate
Rd climbs to ridge atop Inyo Mtns. Great views, wildflowers, and historical mining structures.
Web page w/ Swansea-Cerro Gordo Rd trail info.

Racetrack via Hunter Mtn:

Pg 163, 87mi, full day, moderate
'Moving Rocks' at The Racetrack is interesting, hilly in places with great views, including a spectacular view of Panamint Valley. Teakettle Junction & Lost Burro Mine are 2 interesting features. We will encounter a 'brief' washboard road through Racetrack Valley but is relatively short compared to the commonly used route from Scottys Castle.
Web page w/ info on Lippencott Grade section of this trail.

Armstrong Canyon:

Pg 157, 9mi, 3-4hrs, moderate
Pass mines on way to great capt spot in secluded wooded canyon. Wildflowers and dramatic views of lava domes from 8300 ft.
Web page with info on the Armstrong Canyon trail.

Mazourka Canyon:

Pg 155, 40mi, 5-6hrs, moderate
High views of Owens Valley and the Sierra Nevada. Many secluded, scenic places to camp along this little-used trail. Interesting remote mining spurs we can explore. Trail will climb 9,412ft Mazourka Pk.
Sorry, no decent online descriptions/photos of this trail.

Movie Rd/Alabama Hills:


Pg 159, 25mi, 1+ hrs depending on # of stops, easy
Can spend 1hr or 1 day exploring rock formations so euniqe they've been used in movies for over 70 yrs. Enjoy breathtaking scenery on way to Mt. Whitney. Can explore dozens of side roads to move sites in the Movie Flat Area Sites include Gunga Din Site, Lone Ranger Ambush Site, Gene Autry Rock, Arrastra, etc. I'll need a copy of the Movie Rd Alabama Hills Driving Tour if we want to explore this area properly.
BLM page on Movie Rd / Alabama Hills