since i posted the original question in july I've made four trips to that area south of big sur. here's a few things I've found:
1. coming from the west through Fort Hunter Liggett is a good way. def obey speed limits near the base and don't roll through any stop signs

2. there are two ways up if you come from HWY 1 on the south (from San Simeon/Cambria) -- Nacimiento Ferguson road to Old Coast Road or Los Burros road to Old Coast Road
3. there's lots of other spots for camping and along Old Coast Road in addition to Prewitt Ridge, and definitely a few that are 'out of the way' and very quiet
4. depending the which way you go some of the side tracks you're going to get pinstriped. for me I am totally good with that, but that's a personal decision
5. caltrans did say Hwy1 is going to open potentially in March 2026 which should save some drive time, but also right now since its longer its seemed quiet up there...so takes longer to get there, but road closure is reducing crowds