Superb job on this relatively unknown mountain. Now I want to climb it which is a tribute to the amount of good information you provide. Another one is added to my "to do" list.
Is your "to do" list getting longer or shorter?
We have a "Last Chance Range" not too far away in NV -- that name is probably peppered throughout the west! I often drive by this "other" range on my way to DV.
From the looks of it, I think I prefer the CA Last Chance. It at least has a few trees.
What? You don't consider creosote to be a tree?
The CA peak looks like a greater test of your car and driving skills. ;^)
I took the road into the DPS trailhead (NOT the one described by Dennis), in my 2003 outback with 7.3" clearance (but with skid plates). That was a bit of a challenge; the last 0.3 miles has a section on a steep hill that dips to the east. The road is narrow, partly eroded on the east (downhill) side in little scary notches, and has big humps on the west (uphill) side, due to rockslides from above. Even though you don't have to go over as many lumps to get to the top, the starting point is at 5800', substantially lower than the sulphur mine trailhead.