China needs the plane to land to have a justification to redraw the strategic map. Consistency and "legality" are important here. They would contribute to Chinese credibility.I think at this point the best thing to do is allow Pelosi's plane to land. There are a lot of civilian aircraft in the air and even if only Pelosi's plane is shot down, it could cause needless deaths on the ground.
Let the plane land, let Pelosi disembark and go to her hotel.
Then announce a no fly zone over Taiwan and send a telegram to the ROC regime to negotiate terms of surrender based around a one China two systems with full demilitarisation. Causus belli - an official visit from a US delegation abrogating the protocols agreed with America.
If terms aren't agreed to within 24 hours full scale war commences.