According to a recent report by Intelligence Online, Taiwan’s deputy defense minister secretly visited Israel to seek help in developing the T-Dome.
The outlet says Israel has been providing defense technology and expertise to Taiwan under the guise of civilian programs.
I think the main reason they want the status quo is that they are already effectively an independent nation (just not “officially”), and that any change to the status quo is simply a significant risk to the continued functioning of their effective independent status.