Jack- oh
Whilst you are quite correct that SIDs only exist within CAS, what I was thinking about are departure routes in class G airspace.
As you say, climbing straight ahead off 05/23 is the answer, against traffic arcing for the ILS.
It is evident that the interested parties do require to meet again, and discuss the issues, and this time try and keep the politics to one side.
The bottom line is what is best for the "customers".