Originally posted by GeneV 1) Trekking poles.
Originally posted by GeneV 3) Something to allow the poles to be used as a monopod
You just want a monopod, no need to modify it. Get a good one, maybe carbon fiber, but make sure it's light. Then get a light ballhead for it with a quick-release for the camera.
Originally posted by GeneV 2) a better holster or case.
Either
1-get an attachment system that will fix itself to the straps of your backpack
2-get a sling strap
Either way, get a good hiking backpack with two (at least) pockets, one low and one high. Get an insert (I use Ape Case, cheap and great quality) which fits snugly in either pocket and will hold the gear you want to bring along.
Using a "camera backpack" will never be truly satisfying. No camera bag company that I know really seems to understand the needs of a hiker.