Anything at all will be fine.
A: What do you want to eat tonight?
B: Whatever. (Or: Anything at all.) I don't care.
(And note that in the colloquial expression Oeru (ngaru, poru, etc.) ke'u, the stress in ke'u shifts to the second syllable: ke.'U.)
Do it however you'd like.
Wherever you go, I'll go there too.
No matter who wants (or: may want) to leave, tell them to please stay.
That kind of meat is gross no matter who cooks it.
I work all day and all night, and you don't give a damn!
The answer (to the question) who wants to leave doesn't matter, tell them to please stay.
(No matter who wants (or: may want to leave, tell them to please stay.))
Short time, long time, doesn't matter
(It doesn't matter how long it takes.)