The only people who can do that for money are commercial guiding companies who operate with a permit from Inyo N.F. I used Google, searched for
mountain guides bishop ca and found this page from Inyo National Forest:
Outfitters & Guides They list five guides in Bishop. I would contact each one and ask them. For the $400, I think you might get one of them to help you out.
Good luck! And I hope I can try to follow in your footsteps when I am 79!!