If I were going to replace the fishing equipment (Depending on how much space in the kit it actually took up) I would replace it with Surgical Tubing.

There are a lot of uses for it depending on how much you can actually pack, but in this specific case I was thinking more or less of surgical tubing with a pouch for use in making a slingshot.

Of course my answer may be moot if you're talking about a very small PSK... <img src="/images/graemlins/laugh.gif" alt="" />

Just a thought...

I carry both fishing bits and a slingshot band.

I see by your profile that you are vegitarian.
Why not make up some info cards on your local vegitation that is eatable (or info on the area you will be in)
Also info that maybe required to prepare any plant material harvested. I know some early explorers in Australia died because they seen the Aboriginals gathering plant material, but they didnt see them prepare it to be eaten. (you may want a small magnifying glass to read the small print)

Or to prepare for one of those long term survival situations, throw in a couple of packets of seeds <img src="/images/graemlins/smile.gif" alt="" />