assuming the pilot on the day is concerned enough to to find a solution where there is no SID and no specific clearance (and no clues in the OM's), the best thing i read so far on this thread (from Apate) is:-
"Bottom line is that you are responsible for obstacle clearance. The easiest way to do this would be to follow any published missed approach procedure until MSA is reached for the sector you are departing in."
this seems eminently practical to me...especially if its a airfield where you have no experience.