China tracks stuff that goes into its borders... 10 000 shahed or components for them looks very suspicious, and there are moles within the KMT army that would also tell of such an acquisition plan.russia can't build enough of it during wartime, russia is also under sanction of EU/US. taiwan could just buy bunch commercial mopad, motorbike engine from china during peace time and build up its inventory or produce its own, these drones are low tech, and cheap. all the parts from iran drones except airframe are probably from aliexpress, and they stockpile it during peace time, not during the war.
what if taiwan build tens of thousands of these and store at various location. whats the best defense against these drones. there is not a good way right now except madpand/anti-air guns, but those require line of sight so 5km radius of defense zone, drones with 2000km range, low altitude, faster compare to ground defense, can come from anytime, anywhere, and mainland have alot costal target needs to be protected. due to low tech barrier of these drones, pretty much any country can build it.
When tensions ramp up, Taipei will be under 100x worse sanctions then Russia. And that's not an exaggeration. The CPC effectively controls all shipping and even if necessary can shut down the whole local energy grid. Under such conditions, building even actual mopeds will be nearly impossible let alone airborne ones.
A 100 ish drones isn't unfeasible for the rebel army to acquire, but tens of thousands is completely fanciful.