SDRider,
I have been to the Kern Hot Spring many times over the years. It's a great place once you get there. However, as you know, getting there is the problem. It's a long two days no matter what route you take. But here is a suggestion: At the junction of PCT and Whitney Creek (at lower Crabtree Meadows) cross to the north side and follow the creek until you come to a large packer campsite. From there, there is a cross country route that drops down into the Kern River from. The ******s take it, and I am sure other people on this board. I have been meaning to try that route, but each time I go I have my daughter with me and I get a little nervous. Several years ago, I posted a question as to the viability of dropping down into the Kern River and someone on this board responded with fairly good details of the route. Hopefully someone on this board again can provide more detailed information. From what I understand it takes less then 4 hours once you leave the packer site until you meet up with the Ker River trail.
Good luck