Hi James:
I've not yet found anything but I wanted to let you know I have been looking. You may already know about the following sites, but...
http://www.rootschat.com/links/0z6h/ This site has some newspapers from 1836 to 1922.
http://www.rootschat.com/links/0l15/ This site has newspapers and city directories for San Francisco and other California counties (as well as other databases).
Note: I've only checked San Francisco so far; I will check other counties tonight or during the weekend.
http://www.rootschat.com/links/0z6i/ Oakland Museum of California
This site has interesting information about the gold rush, but you may already know most or all of the facts.
I also searched one of the pay sites, but have not yet found anything.
While looking, I tried Glispin, Glespin, Glis*, Gli*, Hisp, Hesp* and Patrick, Pat, Corporal, Corp, Mr. I've not yet tried Gils*. I looked in a few of the directories around 1864 for Glispin and Crowley and directories around 1850 for Crowley, but didn't see anything for Glispin and couldn't confirm that the Crowley's mentioned were "your" Crowley.
Out of curiosity, do you know where Patrick Glispin was stationed while in California? There are some interesting sites that I have visited: the San Francisco Presidio, Fort Point, and Angel Island. It is amazing to see structures from the civil war era.
Sorry nothing has surfaced so far.
Lisa