Pilots of long haul inbound flights would not appreciate any of these scenarios which could place them in a divert scenario - and your only alternate on mainland Australia is an AFB 300km away.
Continue Approach. Darwin is frequently subject to TEMPO requirements during the wet but only extremely rarely requires an alternate. It is also extremely rare for aircraft to divert to Tindal due weather.
Thunderstorms generally blow through or out well within 60 mins. Diverting to Tindal because of TS activity in Darwin would most likely result in touch down Tindal at about the same time or post the reopening of the Darwin Airport.