My understanding is Meshroom/AliceVision may re-order the camera/path based on the matching, and not necessarily the order they were input. So you'll probably want to use the original image order to build the points, but use the image name to find out the corresponding camera position from the meshroom output.
With the latest AV Photogrammetry node, the third output seems to be the alembic cameras. You can unpack to get at the local coordinate systems, or grab the primitive transform intrinsic attribute. What I'm finding is that Meshroom/AliceVision tend to give vertically inverted outputs even though the rgb axis in the camera output has green pointing up (I assume rgb means xyz). Maybe it's just a left vs right hand thing?
Also this known issue about Alembic import has been around for a few years. Has it been resolved with the latest meshroom-2020.0.1/AliceVision 2.3.0?
Known Issues
Error reporting is relatively light right now
Cameras currently cannot be extracted from the scan due to a bug in Alembic import in Houdini. This should soon be resolved.