Jonanator that is incredibly kind and generous offer!!
From a Federal perspective, shipping by Fedex should be fine.https://help.cbp.gov/app/answe...ZC9XVkNKZUlkbA%3D%3D
From a state level to California since the interested parties are only in California, I think it should be fine since California has a pretty open shipping policy with all the wineries.
If you ship either FedEx or UPS, technically they only ship from senders who are approved merchants and I think the prohibit personal shipping of alcohol.
So my colleague's husband is a craft beer brewer and he ships samples of beer in growlers and 24 oz bottles all over the country through Fedex. Listed as "yeast samples" and he says that nobody has given him a hard time. I do some live coral plugs brokering on the side and "may or may not have" used FedEx to ship live coral specimens internationally. Basically, if you don't tell them it's something they don't ship, they won't reject it.
However, I wouldn't want to pose any sort of risk or hassle on anyone so if there's a better, easier, safer solution, that'd be great to hear!