Very smart idea, thanks for sharing! But I wonder how practical it would be for times when you want to take pictures every few minutes on a trail where you need poles for yourself in between. If you're carrying the poles primarily for setting up your tent and for negotiating just the more difficult parts of the path, or if you only want to pull out the tripod a handful of times, then certainly it's a great weight and space saver.
EDIT: I see you mean to use it as a monopod during the day and just use the trekking poles for low light situations. That makes sense! :)