Link to photos of the rack 'concept', as it stands now: flic.kr/ps/3XSrSG (Bike Forums has a strange limitation on posting URLs)
I realize that these tent poles are pretty weak, and I would not trust them much even for the trekking pole-style tent. They were handy, and actually were split at the ends already from use with a free-standing tent. Before I take this on any real adventure, I plan to replace them with more robust aluminum poles, or perhaps carbon fiber.
The key issues I have right now are
1) Securing the rack to the bottom eyelets, by the axle
2) Side-to-side stability, though perhaps this isn't much of a problem with little weight.
Rubberized suspension clamps seem like a good way to go for attaching poles to the frame.
I have already installed a couple of those on the eyelets next to the seat post, and they seem to be holding well. Ideally, I could loosen up the mounting screws just a few turns and slide the pole out.