I thought I'd follow up the thread with the option I ended up using and how that fared for me.
Setup
After much deliberation I ended up purchasing a Kata KT DL-N-5 Nimble-5 DL Compact Satchel Bag as I decided I wanted to keep all my gear together for when I wanted to just grab and hike. That strategy worked quite well for me. The satchel held my 70-200 and my 16-35 with the D600. I didn't have a tablet along so used that padded area for my Lee filters and holder. There was also room for a small flash, a battery charger, spare battery and cards. The quick draw positioning of the camera made it easy to get the camera in and out of the bag. It also made lens changes simple and straightforward. The split shoulder strap also worked extremely well at keeping the bag comfortably balanced and secured as I was climbing back up steep enbankments from the base of waterfalls. It's water-resistant outer fabric also came in handy around waterfall spray. Overall very happy with the performance of this bag for my purposes on this particular trip. I also took along my fold flat benro travel tripod matched to the RRS BH40.
When travelling the tripod and satchel stayed in a 1560 pelican case. They fitted easily in the case along with two weeks of clothes, toiletries and electronics. The pelican case was lockable when left unattended on the bike. The rollers and extendable handle on the case were also great for the flight over and the few times we had hotel stays. When we were set up at a camp for a few days I would leave the pelican case behind and the satchel would go in the hard saddlebag instead. It was a tight fit in the saddlebag, so I would leave behind the charger and spares, but that worked for a day on the bike. I would bungee the tripod to the pillion seat behind me.
Reflection
Mostly I was satisfied with this setup, though here at home I'm going to trial using a tank bag with a padded removable basket for the camera with lens attached. There were numerous times I would have taken a photo if my camera had been "right there". I still took those pics with my compact S90, but well... lets just say the dynamic range of the DSLRs has spoiled me.
I didn't use a tank bag on this trip for three reasons- worried it would scratch the paint on a borrowed bike; having to take it with me whenever I was out of sight of the bike; no stores local to me carried a tankbag that the camera would fit within.
Photos of Setup
I didn't think to take a photo of the Kata satchel all loaded. However the image from the Kata website does demonstrate it pretty well.
Click here for the link to the Kata website.
Nor did I think to take a photo of the satchel in the pelican case. So only outer shell gear photos I'm afraid. This photo is the bike fully loaded; gear in Kata satchel in the Pelican case. Photo taken with S90 as this was a "get ya wets on" stop.
Day trip setup while camped... pelican case came off and satchel is in the saddlebag. You can see the tripod strapped to the pillion seat. Photocredit to 129slayer.com