You know what I would do? Just for laughs, they should do this.
Everyone remember that time that China sent a mobile oil rig to an area right beside Vietnam? Then they started playing bumper boats on the high seas. That was hilarious!
Why not do something similar here?
Why not just park about 10 super-container ships around some beaches or port around Taiwan? They won't do anything anyways. China is sailing and doing stuff around that area, uncontested.
If the status quo has changed ...
The Vietnamese came to contest and prevent that oil rig from drilling, but they did not have enough force, far from it. Taiwan contests nothing at this stage of the game. Not sure why that is the case.
If they contest nothing, just park those container ships a kilometer off the coast. Why not. They can even turn it into a tourist attraction!
Maybe they can plant that same oil rig there too?!
Thats another escalation beyond what we have now (physical contact between forces, as opposed to just crossing imaginary lines) and for, honestly, not a lot of gain. What we have now is the normalization of Chinese forces crossing the what used to be "red lines" so they can have the best possible locations for launch-off points, all the while Chinese troops get training and familiarization with their jumping-off points.
And it genuinely appears China got this for literally nothing. Like, sure, the western media +Taiwanese media are making a huge deal about various trade delegations made from lower-ranking politicians from the west heading to Taiwan... but literally that was happening for decades. The trade-off for China to be able to position her troops in the best possible locations for a reunification event and let her troops train literally on the waters and in the air they would be contesting in the event of a reunification event is... the west doing exactly what they've been doing for decades, only a little louder.
Thats a win no matter how you slice it. And you don't need to put any more "value-added" stuff on it. Especially when you don't actually get much out of something that is far more blatantly provocative.
As for the other thing about China pre-emptively attacking US bases.
I don't think that should be done. The escalation ladder exists for a reason, and you don't do yourself favors if you try and skip rungs on it.
Furthermore, if China can only win a fight against the US by a surprise attack on US bases, that isn't a win. The US isn't going to sit back and go "well, you destroyed our (expendable) troops, I guess we're done."
Even if we go to the extreme and say we kill every single deployed US soldier in a surprise attack, what happens in a year when the US force the next generation of high school students into the military? Year after that? Year after that? The military is expendable. Soldiers are expendable. Production (whether human or machine) isn't.
In the case of a China vs US war, you have to go through the military and hit the production. The squishy industry. But a full-on invasion of the US isn't what China is aiming for or prepared for, nor does China need it. And yet that is the conclusion of a war between the US and China.
Should a reunification event happen, I believe the US will try to provide E3, satellite, radar jamming and EW services to Taiwan but that's it. China will try and shoot down those planes + satellites, and the US will accept an air war against China, (and China will accept an air war against the US) where ships and planes are legitimate targets but bases are off limits.
Because the time when the US and the west could threaten and/or completely destroy China is over. After a Taiwan reunification both China and the US and the rest of the world still have to live with each other. So they will accept limits to their own fight.
That's not to say China doesn't need nuclear missiles or anti-shipping missiles or ballistic missiles. On the contrary, it is precisely those weapons, demonstrating that China now can match the US on the higher rungs of the escalation ladder, that force the US to keep things low on the escalation ladder.