But F-35B can fly from anywhere with their unique take off capability. US can just build a secret F-35B base in a Japanese forest that hidden from China. They can also use street and road as a temporary forward base. And they can always build F-35B when it is destroyed, because nobody bombarded Lockhead Martin factory.
Plus, how China disturb their logistic route from US to their forward bases. If China's submarines must go through into US security web around Miyako Straight and the sea south of Philippine. With Japan, Taiwan and Philippine with US side, moving to Pacific ocean become very dangerous to any Chinese element. Just like how Houthi disturb the shipping line at the red sea. But now with anti submarine element too.
You don't need F-35B for that. Even F-35A can fly from any decent road. Air forces always practice flying without runways using roads.
What you said about Lockmart factory is true though. China is vulnerable to hypersonic missile strikes by US and its allies on its factories. Which means in a protracted war, they need a way to hit back on CONUS.
There are several ways I can think of to achieve that.
Ultra long range Bomber fleet will be one, ideally H-20 will have that range.
If that level of range is not feasible, then the next option will be a rapid takeover of a small Pacific island using Air borne and amphib force, ALA island hopping strategy of ww2.
Another very good option is to have a large SSGN fleet which can get close to CONUS using concealment and fire their missiles.
the full proof plan is to have a large navy with a lot of carriers that can defeat US navy in open ocean and then get close to CONUS to fire off Land attack missiles.
THE Final final plan will be to have strong alliance with Mexico or carriebean island countries like Cuba or Haiti. Then China can launch attacks on CONUS with ease.
The last idea is ofcourse too difficult now. Most likely not feasible for atleast 40-50 years. But building a really powerful navy is possible in the next 20 years. Building a Bomber fleet and SSGN fleet is possible in the next 15 years.
So, China should not fight US for the next 20 years. Hide and Bide, increase budget rapidly.