Not to belabor the point, but do you realize that the LowePro harness doesn't come with a belt? It is _just_ a harness, meant only to hold up either the S&F Light or Deluxe belts. It doesn't do any good on its on. So first, you need to pick a belt to use it with.
Yeah, this was the thing I was very confused to start with
1) The harness straps probably would be in the way if you also wear a backpack. You would have two sets of shoulder straps trying to fit in the same place, not an easy fit.
I kinda suspect that, but that is not a lot of time that would acour.
2) Not sure I understand what you are suggesting here. If you use a big pack like the Bergan you link to, and use its hip belt, then you really wouldn't be able to use the harness at all, because it is only for holding up a S&F hip belt that would be trying to ride in exactly the same place as the hip belt from the pack. It would be like trying to wear two backpacks at once, with two hip belts.
Same as above.
3) Yes, _if_ you aren't also trying to wear a backpack.
Suggestion, with as little equipment as you are talking about, why not carry them in the backpack? There are numerous threads about how people have adapted backpacks on other photography sites, and for the small amount of equipment you are talking about, a few pouches inside the pack might be your best bet.
There is no way in hell im packing my lenses in a backpack, that would take to much time and effort during a day out. I need them quick. So the final questions is still yet to be answered.
What pouches would go with my tiny equipment.
The belt and harness confusion is no more
Thank you for your time