Good number of saildrive owners have by-passed saildrive leg for
their raw water intake. Should use reinforced hose as hose
walls can collapse with suction...also want to install in line strainer.
Then decide which is the lesser evil...leaving sea cocc open and risk
problem when your away from boat or forgetting to open before
starting motor. ...Some leave keys on sea cocc as reminder.
Have not by-passed mine yet but have to keep clean
with having bottom cleaned often and diving occasionally.
If you were to toggle between two intakes you might find one
sometimes clogged if not used often.
In any case until you change make sure your overheating
alarm/lights are working.