Not so much a question as as bug report I guess.
Arnold ROPs don't do a good job of respective relative paths to operators
For example, in the AOV shader parameter
does NOT work
This is not ideal, as it kills the flexibility of wrapping up setups to pass to other artists and scenes. There's been a few instances of this in other areas, such as when writing ASS archives of geo contained in objnets. I'll update this post when I find more.