14.
Prefer Pipeline Road
The "on foot" way to Pipeline Road is to hike in from the Ski Basin parking lot following the Nordic Ski Trail, then follow the Canyon Trail over the top of Canada Bonita to its intersection with Pipeline Road. This is about a 1-1.5 hour hike.
Pipeline Road is also accessible via 4WD from the west edge of Los Alamos, but you'll need a permit to access the Guaje Canyon Trail. The permit to drive to Pipeline is from the JMTR and will be straightforward to get to any operator who wants to drive out there. The rough road is about six miles long and can take two or more hours to drive.
This is NOT a journey suited to your average SUV. You need a true high clearance, big tire 4WD with a slow, low range transmission to make the climbs with confidence. I've seen it done in 4WD pickups, but only by really experienced off roaders. Plan on getting a lot of brush scratches because the vegetation encroaches the trail a lot. It's one of those rides where you're hanging on tight all the way and can say "Yay! I did it!" at the end.
Either route consumes enough of the day that station personnel usually come up the day before, camp overnight, and descend when the station closes or the following morning.
Aid station crew might be able to accommodate ferrying an operator out there, but you would likely not get a ride back until Sunday morning. We would prefer that nobody drive this road at night while fatigued after a long day working the aid station. Losing control on this trail would make the news.
There are people who specialize in this aid station, so I wouldn't worry too much about it.