As far as humanitarian efforts go you really have no earned any good will, there are reasons why the targets are set as percentage of GNI rather than as absolute terms. In fact if anything there would be ill-will from other western nations who could rightfully view you as being scrooges on the money. From countries where you have put aid into though there will be good will (and lasting good will at that, see my comment on Africa again).
As for the World War thing, I personally don't have much good will towards your efforts there as it was done (at least in WWII, I'm not that knowledgeable on WWI) clearly and entirely in the interests of your own pride and power. It wasn't a valiant effort to save other countries. But in any case, you should be asking Europeans (especially the French really) whether they feel there was ever any good will earned, not a New Zealander.
I'm done with this, it's just going to end up being circular.
