We live here only temporary should be accepted
...temporarily
As it is referring to duration, we cannot use present simple.
'We are living here only...' 'We have lived here only...'
Also if you are talking about on a short a amount of time, you'll need to add '...for a short while'
'We have lived here for a while' means the duration has been long.
Is this sentence better said without the word "untuk"?
Both ok to me
There is not 'while' in the option. Duh