I think it is impossible to lose by such a margin in a T20 match, but the game will be very challenging because after losing the Test series, the desire to win will definitely arise in the minds of the West Indies team players and the possibility of performing well will be the highest.
West Indies are a different team altogether in the T20 format which is why this could be a competitive series considering the fact that it's a 5 match series. I would still give the edge to the Aussies though.
They can acquire some sort of relief after that humiliating test series whitewash if they end up winning this T20 series though.
After having humiliating defeat in test series and facing worst ever performance in last test match at Kingston CWI needs to check their mistakes and fixed them because now they have no more time for staying on their worst strategy which already kill cricket here in the Caribbean.
14.3 over just 27 runs and 7 batsmen gone on duck mean they are almost on lowest level with no chances of survival if they want to have something better done quick settlements and bring their best players back into their original uniform which can give them some hope of lifeline. If they are feeling it's not going to work then surely they needed to be done big decision and end their journey into cricket with have changes and bring all Islands their own teams in T20 and end their journey into test format which could be honourable decision for them.