I do  not want to use SCOOP because I want to split out the threads in my design into separate [multiple] processes on separate machines, and SCOOP does not permit that AFAIK

Re-reading the documentation, it would seem to be implied that I can add the threads library to a 'Concurrency = None' project which I will try next ...

The documentation says, explicitly, that the thread library cannot be used wit 'Concurrency = SCOOP'

Is the concept of 'Concurrency = Thread' now redundant ?