You boys were a little late, we got back last night!
Thanks anyway for the help, maybe I should have posted a little earlier.
We ended up booking a commercial rafting trip despite my girlfriend and I both having a little experience in a raft. The company we booked with ended up just being a reseller and so when we finally got to the river we found that the actual rafting company is an association put together by a government agency to promote tourism development within the indigenous community (Rafting en el RÃ*o CahabÃ³n
) - NRS had kicked in some gear (big props to them) and eight indigenous men underwent a 45 day training about a year ago. I had insisted on running the lower section of the Lanquin, above the Cahabon / Lanquin confluence, and they struggled a little with that section, but in the end we came back down and volunteered some time to help them a little which was really rewarding.
The entire area is so beautiful and I'm sure there's a lot of paddling to be done for someone with the initiative. I'd certainly like to go back someday and see more of the region.
Thanks again for those who contributed their ideas and info!