At the risk of inuring the Wrath of Stick, I wonder if you can address the metal basket issue from a different angle. What is root reason why they are balking at metal? My guess is that metal isn't the underlying issue, but instead unnatural, industrial look of the baskets is the issue. A cold, galvanized, chain-filled metal cage is contradictory with natural beauty of a Peninsula park. Nobody wants a pretty park dotted with eye-sores. If we built wooden-bamboo-rope-wind-chime baskets and painted them bright silver they would veto that, too. If this is indeed the issue, maybe we have some other options. Here are some that I though of:
Use regulation baskets, but disguise them: could real baskets be covered in a natural material like wood, bamboo, rope, etc? The poles could be placed inside hollowed-out tree limbs tree trunks, the baskets wrapped wrapped in something natural or more visually pleasing. The baskets (especially the chains) could also be painted in earth tones so they blend in better; it might make it hard for us to see them but it's a compromise.
Build baskets with a natural or Bay Area theme: Anderson Valley Brewing Company (
http://www.avbc.com/tour/disc-golf/) has a disc golf course and built baskets using old wine barrels, bicycle wheels, and other materials consistent with the Bay Area's reputation. This might be more palatable to the parks people and even gives them an opportunity to involve local artists and craftsmen to built their own take on a natural or Bay Area-themed basket, given the PDGA-regulation dimensions as a basis; I'm thinking of the popularity of the "Hearts of San Francisco" sculptures here in SF or the painted cows in Chicago. Parks people love getting the community involved.
What do you think?
Here are some photos of AVBC's baskets:

