CAR 206 might help. From what you have described would be a private operation.
Nothing different in terms of a legal context to a vet flying out to do a job on a sick or injured animal or a mustering pilot hearding cattle to be sold - someone is making money indirectly out of the operation. Shouldn't be a gold plated service IMHO.
If you get anything out of CASA that might answer your question, make sure it's in writing even if it's in the form of a one lined email.