Best way to get 60k (after tax) income forever?

[Snow Leopard]

At the point that 'a fair bit of time away' becomes now then $60k will not be what it used to be.
You will need/want more ( and then more again ).

I am going to guess that under the hood that TWF is a wrapper around another fund. If so then you could possibly improve your returns by buying the underlying fund directly if you feel up to handling any extra tax forms etc.

Personally I would diverse into several different areas, overseas, domestic, NZ shares etc.

But it is up to you to do the research and decide what is right for you.