Thanks OzExpat, that pretty much said it. One of the major areas of concern in designing OEI escape routes is the scenario where the engine fails AFTER that point in the flight where the SID and the OEI Special Procedure deviate, and obstacle clearance is not yet ensured.
The solution that I apply to the problem in those departures where obstacles during the SID are excessive is to devise 2 sets of RTOWs for the same runway, one to follow the SID, and the other commited to the Special Procedure.
(1) If the Actual Takeoff Weight is at or less than that which would comply with engine failure during the SID, then fine, accept the SID.
(2) If the Actual Takeoff Weight EXCEEDS that for compliance with the SID (but obviously at or less than that for the Special Procedure), advise ATC that the SID is not acceptable, and advise of your requirement to follow the Special Procedure routing until MSA is reached.
That's the data that I give to 'my customers', others may do it differently, Mutt, John_T?
Regards, and Compliments of the Season,
Old Smokey