I don’t know anyone in that area, but I’ve been able to get short-term rentals in other places by offering the landlord more money than they are asking for, and saying I understand it would be a pain to have to find someone else quickly.
I am of course not saying this, but it has happened before in Taiwan that people have broken leases. There’s usually a clause in the lease stating how it would be handled. You may want to just think about “legally” breaking your lease if needed, by paying whatever the penalty in the contract is. It might end up being less money and trouble that trying to convince a landlord to go shorter term, but be prepared to let some money go. If you think that might be an option, you could calculate the penalty as just a higher monthly rent in your mind.