I know I posted about this in NEV thread but this might be useful in here too: what about widespread use of IEP/hybrid drive for combat vehicles and ships? It seems highly relevant for Taiwan.
Advantage of IEP and hybrid drive:
1. Lower tactical IR and acoustic signature as you can turn off engines and run on battery when near combat zones. This would especially be important in shallow littoral regions, beaches, forest, etc. Exactly what you expect near Taiwan. Many Russian vehicle losses have been from thermal sights or being heard from miles away.
2. More fuel efficient than pure fossil fuel vehicles but has the raw power density of fossil fuel vehicles. Again important for Taiwan where, to maintain strategic surprise, many vehicles will need to drive themselves to the beach. Also important because some foreign powers might blockade crude oil. Russian buildup was discovered early while a hybrid wheeled vehicle fleet would be able to park at base until the last day when it would just drive itself to the front.
3. Higher power generation capability because now you can use the entire engine for electricity. Better ground based radar, laser, jammer, comm station, etc. Another Russian weakness.
Seems like it would be a good idea for the medium term (10-15 years) to electrify the army and navy.