So far as you know. My impression is that especially Japan's strategy is always to keep itself at the threshold of becoming a full nuclear weapons with very lit

So far as you know. My impression is that especially Japan's strategy is always to keep itself at the threshold of becoming a full nuclear weapons with very little effort given the Geo political situation. They already have a full fledged delivery mechanism in their space launch program. Given how cheap SpaceX is, the only reason for keeping these programs around is really weapons delivery. Given the even more unique political situation of Taiwan and the strategic global importance of TSMC, it's very likely they have some option to weaponize - even if only dirty bombs.