@Arvin: nope, one at a time, don't be greedy.
And the one you mentioned on airlayering the vine and then do cutting on it, that will do as well, read it in a nepenthes book before, but never try though.
I actually did the second one on N. mirabilis but failed, as the vine I used was quite a long one, one time a big wind hit it, ended up broken vine, so cut it off then just left some protuding part of the vine, now a new basal growed out again from the vine.
Ed