I've never had a problem 'running' the Canal early war, even blowing away aircraft and lone cargo ships en route. (80%/GWX - I keep the external camera and do not manually aim torps)
Surface at night, submerge during the day.
ASW Trawlers can't really hurt you as they don't have ASDIC, just creep away if they spot you on the surface. Destroyers are relatively rare,
but realize that engaging convoys in 20m of water, even early war, is a pretty good way to die quickly.
If you use the mod that introduces 'Harbor Launch' boats - for whatever reason they DO have ASDIC, and will not lose you in 20 meters of water.
You will have to sink them on the surface. Luckily it only takes a single deck gun shot.
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