Air-Tenere trips on short notice?
My wife and I have traveled fairly widely in Central Asia and SE Asia but are total newbies to the Sahara. We'll be in Niger in early December for around 12 days and are going to pop up to Agadez. My question is, how difficult is it to arrange a short (5-8 day) tour of the Air/western Tenere on very short notice? I have already written to Dunes Voyages, Celine/Akly, and a few other reputedly solid outfits for price quotes. Dunes Voyages was the cheapest -- actually, the only one we could possibly afford as a bespoke trip for the two of us. Of course, we would prefer to go to Agadez and see if it's possible to join up with another group for reasons of cost and security. Are we deluded? Should we confirm with Dunes Voyages now? Or is it feasible to wait til we get to Agadez to compare prices and seek to join up with other travelers? I'm not sure whether tourism in the region has slowed due to the sporadic earlier attacks. Also, I'm assuming we're not taking undue risks (granting there are always risks) if we head out on an expedition arranged just for us, i.e. in only one vehicle. Given the time frame the itinerary would of course stick to the better-traveled destinations: Chiriet, Arakao, Timia, etc.
Thanks a lot for any insights.